2130 lines
35 KiB
HTML
2130 lines
35 KiB
HTML
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<meta name="description" content="
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Regular Expressions
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#
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Regular expressions are a powerful tool for describing patterns in text. They are used in several OBITools
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like
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obigrep
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,
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obiannotate
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or
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obiscript
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.
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Single characters
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#
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Pattern
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Description
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.
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any character, possibly including newline (flag s=true)
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[xyz]
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character class
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[^xyz]
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negated character class
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[[:alpha:]]
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ASCII character class
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[[:^alpha:]]
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negated ASCII character class
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Composites
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#
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Pattern
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Description
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xy
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x followed by y
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x|y
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x or y (prefer x)
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Repetitions
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#
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Pattern
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Description
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x*
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zero or more x, prefer more
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x+
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one or more x, prefer more
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x?
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zero or one x, prefer one
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x{n,m}
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n or n+1 or … or m x, prefer more
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x{n,}
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n or more x, prefer more
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x{n}
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exactly n x
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x*?
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zero or more x, prefer fewer
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x+?
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one or more x, prefer fewer
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x??
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zero or one x, prefer zero
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x{n,m}?
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n or n+1 or … or m x, prefer fewer
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x{n,}?
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n or more x, prefer fewer
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x{n}?
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exactly n x
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Grouping
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Pattern
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Description
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(re)
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numbered capturing group (submatch)
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(?P<name>re)
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named & numbered capturing group (submatch)
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(?<name>re)
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named & numbered capturing group (submatch)
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(?:re)
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non-capturing group
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(?flags)
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set flags within current group; non-capturing
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(?flags:re)
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set flags during re; non-capturing
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Character classes
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#
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Pattern
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Description
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[\d]
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digits (== \d)
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[^\d]
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not digits (== \D)
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[\D]
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not digits (== \D)
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[^\D]
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not not digits (== \d)
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[[:name:]]
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named ASCII class inside character class (== [:name:])
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[^[:name:]]
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named ASCII class inside negated character class (== [:^name:])
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[\p{Name}]
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named Unicode property inside character class (== \p{Name})
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[^\p{Name}]
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named Unicode property inside negated character class (== \P{Name})
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Named character classes
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#
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Pattern
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Description
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[[:alnum:]]
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alphanumeric (== [0-9A-Za-z])
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[[:alpha:]]
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alphabetic (== [A-Za-z])
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[[:ascii:]]
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ASCII (== [\x00-\x7F])
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[[:blank:]]
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blank (== [\t ])
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[[:cntrl:]]
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control (== [\x00-\x1F\x7F])
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[[:digit:]]
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digits (== [0-9])
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[[:graph:]]
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graphical (== [!-~] == [A-Za-z0-9!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~])
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[[:lower:]]
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lower case (== [a-z])
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[[:print:]]
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printable (== [ -~] == [[:graph:]])
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[[:punct:]]
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punctuation (== [!-/:-@[-\`{-~])
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[[:space:]]
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whitespace (== [\t\n\v\f\r ])
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[[:upper:]]
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upper case (== [A-Z])
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[[:word:]]
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word characters (== [0-9A-Za-z_])
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[[:xdigit:]]
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hex digit (== [0-9A-Fa-f])
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">
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<meta name="theme-color" media="(prefers-color-scheme: light)" content="#ffffff">
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<meta name="color-scheme" content="light dark"><meta property="og:url" content="http://metabar:8888/obidoc/docs/patterns/regular/">
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<meta property="og:title" content="Regular Expressions">
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<meta property="og:description" content="Regular Expressions # Regular expressions are a powerful tool for describing patterns in text. They are used in several OBITools like obigrep , obiannotate or obiscript .
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Single characters # Pattern Description . any character, possibly including newline (flag s=true) [xyz] character class [^xyz] negated character class [[:alpha:]] ASCII character class [[:^alpha:]] negated ASCII character class Composites # Pattern Description xy x followed by y x|y x or y (prefer x) Repetitions # Pattern Description x* zero or more x, prefer more x+ one or more x, prefer more x? zero or one x, prefer one x{n,m} n or n+1 or … or m x, prefer more x{n,} n or more x, prefer more x{n} exactly n x x*? zero or more x, prefer fewer x+? one or more x, prefer fewer x?? zero or one x, prefer zero x{n,m}? n or n+1 or … or m x, prefer fewer x{n,}? n or more x, prefer fewer x{n}? exactly n x Grouping # Pattern Description (re) numbered capturing group (submatch) (?P<name>re) named & numbered capturing group (submatch) (?<name>re) named & numbered capturing group (submatch) (?:re) non-capturing group (?flags) set flags within current group; non-capturing (?flags:re) set flags during re; non-capturing Character classes # Pattern Description [\d] digits (== \d) [^\d] not digits (== \D) [\D] not digits (== \D) [^\D] not not digits (== \d) [[:name:]] named ASCII class inside character class (== [:name:]) [^[:name:]] named ASCII class inside negated character class (== [:^name:]) [\p{Name}] named Unicode property inside character class (== \p{Name}) [^\p{Name}] named Unicode property inside negated character class (== \P{Name}) Named character classes # Pattern Description [[:alnum:]] alphanumeric (== [0-9A-Za-z]) [[:alpha:]] alphabetic (== [A-Za-z]) [[:ascii:]] ASCII (== [\x00-\x7F]) [[:blank:]] blank (== [\t ]) [[:cntrl:]] control (== [\x00-\x1F\x7F]) [[:digit:]] digits (== [0-9]) [[:graph:]] graphical (== [!-~] == [A-Za-z0-9!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~]) [[:lower:]] lower case (== [a-z]) [[:print:]] printable (== [ -~] == [[:graph:]]) [[:punct:]] punctuation (== [!-/:-@[-\`{-~]) [[:space:]] whitespace (== [\t\n\v\f\r ]) [[:upper:]] upper case (== [A-Z]) [[:word:]] word characters (== [0-9A-Za-z_]) [[:xdigit:]] hex digit (== [0-9A-Fa-f])">
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<title>Regular Expressions | OBITools4 documentation</title>
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<a href="/obidoc/formats/fasta/" class="">FASTA file format</a>
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<a href="/obidoc/formats/fastq/" class="">FASTQ file format</a>
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<a href="/obidoc/formats/genbank/" class="">GenBank Flat File format</a>
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<ul>
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<a href="/obidoc/formats/embl/" class="">EMBL Flat File format</a>
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<ul>
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<a href="/obidoc/docs/file_format/sequence_files/csv/" class="">CSV format</a>
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<a href="/obidoc/formats/json/" class="">JSON format</a>
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<ul>
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<li>
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<a href="/obidoc/docs/file_format/sequence_files/annotations/" class="">Annotation of sequences</a>
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<ul>
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</ul>
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<a role="button" class="">Taxonomy file formats</a>
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</label>
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<ul>
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<li>
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<a href="/obidoc/docs/file_format/taxonomy_file/csv_taxdump/" class="">CSV formatted taxdump</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/file_format/taxonomy_file/ncbi_taxdump/" class="">NCBI taxdump</a>
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<ul>
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</ul>
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</li>
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</ul>
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<li>
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<a href="/obidoc/formats/csv/" class="">The CSV format</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<a role="button" class="">Patterns</a>
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</label>
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<a href="/obidoc/docs/patterns/regular/" class="active">Regular Expressions</a>
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<li>
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<a href="/obidoc/docs/patterns/dnagrep/" class="">DNA Patterns</a>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-8223f464911a1fe6c655972143684e93" class="toggle" />
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<label for="section-8223f464911a1fe6c655972143684e93" class="flex justify-between">
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<a role="button" class="">The OBITools4 commands</a>
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</label>
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<ul>
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<li>
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<a href="/obidoc/docs/commands/options/" class="">Shared command options</a>
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<ul>
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</ul>
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<li>
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<input type="checkbox" id="section-8921ea65523c266b128dd4263232b0fc" class="toggle" />
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<label for="section-8921ea65523c266b128dd4263232b0fc" class="flex justify-between">
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<a role="button" class="">Basics</a>
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obiannotate/" class="">obiannotate</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obicomplement/" class="">obicomplement</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obiconvert/" class="">obiconvert</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obicount/" class="">obicount</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obicsv/" class="">obicsv</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obidemerge/" class="">obidemerge</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obidistribute/" class="">obidistribute</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obigrep/" class="">obigrep</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obijoin/" class="">obijoin</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obimatrix/" class="">obimatrix</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obisplit/" class="">obisplit</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obisummary/" class="">obisummary</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obiuniq/" class="">obiuniq</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-dbdf1bb5377572439394e60e08c30f50" class="toggle" />
|
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<label for="section-dbdf1bb5377572439394e60e08c30f50" class="flex justify-between">
|
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<a role="button" class="">Demultiplexing samples</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obimultiplex/" class="">obimultiplex</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obitagpcr/" class="">obitagpcr</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-aa98fedd067b51150db59691a8ea8edd" class="toggle" />
|
|
<label for="section-aa98fedd067b51150db59691a8ea8edd" class="flex justify-between">
|
|
<a role="button" class="">Sequence alignments</a>
|
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</label>
|
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<ul>
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<li>
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<a href="/obidoc/obitools/obiclean/" class="">obiclean</a>
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<ul>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-7433746525d8c2b29b033f765c869acd" class="toggle" />
|
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<label for="section-7433746525d8c2b29b033f765c869acd" class="flex justify-between">
|
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<a href="/obidoc/obitools/obipairing/" class="">obipairing</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/docs/commands/alignments/obipairing/fasta-like/" class="">The FASTA-like alignment</a>
|
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/commands/alignments/obipairing/exact-alignment/" class="">Exact alignment</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obipcr/" class="">obipcr</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obirefidx/" class="">obirefidx</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obitag/" class="">obitag</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-5746f699d10490780dec8e30ab2dd3ce" class="toggle" />
|
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<label for="section-5746f699d10490780dec8e30ab2dd3ce" class="flex justify-between">
|
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<a role="button" class="">Taxonomy</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obitaxonomy/" class="">obitaxonomy</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-3f50c4fe7ab436a56ae92897d5444956" class="toggle" />
|
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<label for="section-3f50c4fe7ab436a56ae92897d5444956" class="flex justify-between">
|
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<a role="button" class="">Advanced tools</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obiscript/" class="">obiscript</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-549be3934679fcb82a232f6bd5435563" class="toggle" />
|
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<label for="section-549be3934679fcb82a232f6bd5435563" class="flex justify-between">
|
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<a role="button" class="">Others</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obimicrosat/" class="">obimicrosat</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-ceca4455173761e30cbc0a6dc2327167" class="toggle" />
|
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<label for="section-ceca4455173761e30cbc0a6dc2327167" class="flex justify-between">
|
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<a role="button" class="">Experimentals</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/obitools/obicleandb/" class="">obicleandb</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obiconsensus/" class="">obiconsensus</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/obitools/obilandmark/" class="">obilandmark</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/commands/tags/" class="">Glossary of tags</a>
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</li>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-9b1bcd52530c59dc4819b1f61c128f54" class="toggle" />
|
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<label for="section-9b1bcd52530c59dc4819b1f61c128f54" class="flex justify-between">
|
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<a role="button" class="">Cookbook</a>
|
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</label>
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<ul>
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<li>
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<a href="/obidoc/docs/cookbook/illumina/" class="">Analysing an Illumina data set</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/cookbook/ecoprimers/" class="">Designing new barcodes</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/cookbook/local_genbank/" class="">Prepare a local copy of Genbank</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/cookbook/reference_db/" class="">Build a reference database</a>
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<ul>
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</ul>
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</li>
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<li>
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<a href="/obidoc/docs/cookbook/minion/" class="">Oxford Nanopore data analysis</a>
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<ul>
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</ul>
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</li>
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</ul>
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</li>
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<li>
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<span>Programming OBITools</span>
|
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<ul>
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<li>
|
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<a href="/obidoc/docs/programming/expression/" class="">Expression language</a>
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<ul>
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</ul>
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</li>
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<li>
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<input type="checkbox" id="section-6d580829a667b5cca790b286d99a10fe" class="toggle" />
|
|
<label for="section-6d580829a667b5cca790b286d99a10fe" class="flex justify-between">
|
|
<a href="/obidoc/docs/programming/lua/" class="">Lua: for scripting OBITools</a>
|
|
</label>
|
|
|
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<ul>
|
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<li>
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<h3>Regular Expressions</h3>
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<ul>
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<li><a href="#regular-expressions">Regular Expressions</a>
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<ul>
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<li><a href="#single-characters">Single characters</a></li>
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<li><a href="#composites">Composites</a></li>
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<li><a href="#repetitions">Repetitions</a></li>
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<li><a href="#grouping">Grouping</a></li>
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<li><a href="#character-classes">Character classes</a></li>
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<li><a href="#named-character-classes">Named character classes</a></li>
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</header>
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<article class="markdown book-article"><h1 id="regular-expressions">
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Regular Expressions
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<a class="anchor" href="#regular-expressions">#</a>
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</h1>
|
|
<p>Regular expressions are a powerful tool for describing patterns in text. They are used in several <abbr title="A set of unix command line tools for manipulating DNA metabarcoding data">OBITools</abbr>
|
|
like <a href="http://metabar:8888/obidoc/obitools/obigrep/">
|
|
<abbr title="obigrep: filter a sequence file"><code>obigrep</code></abbr>
|
|
</a>, <a href="http://metabar:8888/obidoc/obitools/obiannotate/">
|
|
<abbr title="obiannotate: edit sequence annotations"><code>obiannotate</code></abbr>
|
|
</a> or <a href="http://metabar:8888/obidoc/obitools/obiscript/">
|
|
<abbr title="obiscript: apply a LUA script to a sequence file"><code>obiscript</code></abbr>
|
|
</a>.</p>
|
|
<h2 id="single-characters">
|
|
Single characters
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|
<a class="anchor" href="#single-characters">#</a>
|
|
</h2>
|
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<table>
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<thead>
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<tr>
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<th>Pattern</th>
|
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>.</code></td>
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<td>any character, possibly including newline (flag s=true)</td>
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</tr>
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<tr>
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<td><code>[xyz]</code></td>
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<td>character class</td>
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</tr>
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<tr>
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<td><code>[^xyz]</code></td>
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<td>negated character class</td>
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</tr>
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<tr>
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<td><code>[[:alpha:]]</code></td>
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<td>ASCII character class</td>
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</tr>
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<tr>
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<td><code>[[:^alpha:]]</code></td>
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<td>negated ASCII character class</td>
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</tr>
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</tbody>
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</table>
|
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<h2 id="composites">
|
|
Composites
|
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<a class="anchor" href="#composites">#</a>
|
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</h2>
|
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<table>
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<thead>
|
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<tr>
|
|
<th>Pattern</th>
|
|
<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>xy</code></td>
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<td>x followed by y</td>
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</tr>
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<tr>
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<td><code>x|y</code></td>
|
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<td>x or y (prefer x)</td>
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</tr>
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</tbody>
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</table>
|
|
<h2 id="repetitions">
|
|
Repetitions
|
|
<a class="anchor" href="#repetitions">#</a>
|
|
</h2>
|
|
<table>
|
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<thead>
|
|
<tr>
|
|
<th>Pattern</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
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<tbody>
|
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<tr>
|
|
<td><code>x*</code></td>
|
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<td>zero or more x, prefer more</td>
|
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</tr>
|
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<tr>
|
|
<td><code>x+</code></td>
|
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<td>one or more x, prefer more</td>
|
|
</tr>
|
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<tr>
|
|
<td><code>x?</code></td>
|
|
<td>zero or one x, prefer one</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n,m}</code></td>
|
|
<td>n or n+1 or … or m x, prefer more</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n,}</code></td>
|
|
<td>n or more x, prefer more</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n}</code></td>
|
|
<td>exactly n x</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x*?</code></td>
|
|
<td>zero or more x, prefer fewer</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x+?</code></td>
|
|
<td>one or more x, prefer fewer</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x??</code></td>
|
|
<td>zero or one x, prefer zero</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n,m}?</code></td>
|
|
<td>n or n+1 or … or m x, prefer fewer</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n,}?</code></td>
|
|
<td>n or more x, prefer fewer</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>x{n}?</code></td>
|
|
<td>exactly n x</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<h2 id="grouping">
|
|
Grouping
|
|
<a class="anchor" href="#grouping">#</a>
|
|
</h2>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Pattern</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>(re)</code></td>
|
|
<td>numbered capturing group (submatch)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>(?P<name>re)</code></td>
|
|
<td>named & numbered capturing group (submatch)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>(?<name>re)</code></td>
|
|
<td>named & numbered capturing group (submatch)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>(?:re)</code></td>
|
|
<td>non-capturing group</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>(?flags)</code></td>
|
|
<td>set flags within current group; non-capturing</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>(?flags:re)</code></td>
|
|
<td>set flags during re; non-capturing</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<h2 id="character-classes">
|
|
Character classes
|
|
<a class="anchor" href="#character-classes">#</a>
|
|
</h2>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Pattern</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>[\d]</code></td>
|
|
<td>digits (== \d)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[^\d]</code></td>
|
|
<td>not digits (== \D)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[\D]</code></td>
|
|
<td>not digits (== \D)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[^\D]</code></td>
|
|
<td>not not digits (== \d)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:name:]]</code></td>
|
|
<td>named ASCII class inside character class (== [:name:])</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[^[:name:]]</code></td>
|
|
<td>named ASCII class inside negated character class (== [:^name:])</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[\p{Name}]</code></td>
|
|
<td>named Unicode property inside character class (== \p{Name})</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[^\p{Name}]</code></td>
|
|
<td>named Unicode property inside negated character class (== \P{Name})</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<h2 id="named-character-classes">
|
|
Named character classes
|
|
<a class="anchor" href="#named-character-classes">#</a>
|
|
</h2>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Pattern</th>
|
|
<th>Description</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td><code>[[:alnum:]]</code></td>
|
|
<td>alphanumeric (== <code>[0-9A-Za-z]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:alpha:]]</code></td>
|
|
<td>alphabetic (== <code>[A-Za-z]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:ascii:]]</code></td>
|
|
<td>ASCII (== <code>[\x00-\x7F]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:blank:]]</code></td>
|
|
<td>blank (== <code>[\t ]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:cntrl:]]</code></td>
|
|
<td>control (== <code>[\x00-\x1F\x7F]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:digit:]]</code></td>
|
|
<td>digits (== <code>[0-9]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:graph:]]</code></td>
|
|
<td>graphical (== <code>[!-~]</code> == <code>[A-Za-z0-9!"#$%&'()*+,\-./:;<=>?@[\\\]^_`{|}~])</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:lower:]]</code></td>
|
|
<td>lower case (== <code>[a-z]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:print:]]</code></td>
|
|
<td>printable (== <code>[ -~]</code> == <code>[[:graph:]]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:punct:]]</code></td>
|
|
<td>punctuation (== <code>[!-/:-@[-\`{-~]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:space:]]</code></td>
|
|
<td>whitespace (== <code>[\t\n\v\f\r ]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:upper:]]</code></td>
|
|
<td>upper case (== <code>[A-Z]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:word:]]</code></td>
|
|
<td>word characters (== <code>[0-9A-Za-z_]</code>)</td>
|
|
</tr>
|
|
<tr>
|
|
<td><code>[[:xdigit:]]</code></td>
|
|
<td>hex digit (== <code>[0-9A-Fa-f]</code>)</td>
|
|
</tr>
|
|
</tbody>
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</table>
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</article>
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<li><a href="#regular-expressions">Regular Expressions</a>
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<ul>
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<li><a href="#single-characters">Single characters</a></li>
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<li><a href="#composites">Composites</a></li>
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<li><a href="#repetitions">Repetitions</a></li>
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<li><a href="#grouping">Grouping</a></li>
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<li><a href="#character-classes">Character classes</a></li>
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