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    Parle pattern matching

    Parle supports regex matching similar to flex. Also supported are the following POSIX character sets: [:alnum:], [:alpha:], [:blank:], [:cntrl:], [:digit:], [:graph:], [:lower:], [:print:], [:punct:], [:space:], [:upper:], [:xdigit:] .

    The Unicode character classes are currently not enabled by default, pass --enable-parle-utf32 to make them available. A particular encoding can be mapped with a correctly constructed regex. For example, to match the EURO symbol encoded in UTF-8, the regular expression [\xe2][\x82][\xac] can be used. The pattern for an UTF-8 encoded string could be [ -\x7f]{+}[\x80-\xbf]{+}[\xc2-\xdf]{+}[\xe0-\xef]{+}[\xf0-\xff]+.

    Character representations

    Character representations
    SequenceDescription
    \aAlert (bell).
    \bBackspace.
    \eESC character, \x1b.
    \nNewline.
    \rCarriage return.
    \fForm feed, \x0c.
    \tHorizontal tab, \x09.
    \vVertical tab, \x0b.
    \octCharacter specified by a three-digit octal code.
    \xhexCharacter specified by a hex code.
    \ccharNamed control character.

    Character classes

    Character classes
    SequenceDescription
    [...]A single character listed or contained within a listed range. Ranges can be combined with the {+} and {-} operators. For example [a-z]{+}[0-9] is the same as [0-9a-z] and [a-z]{-}[aeiou] is the same as [b-df-hj-np-tv-z].
    [^...]A single character not listed and not contained within a listed range.
    .Any character, default [^\n].
    \dDigit character, [0-9].
    \DNon-digit character, [^0-9].
    \sWhite space character, [ \t\n\r\f\v].
    \SNon-white space character, [^ \t\n\r\f\v].
    \wWord character, [a-zA-Z0-9_].
    \WNon-word character, [^a-zA-Z0-9_].

    Unicode character classes

    Unicode character classes
    SequenceDescription
    \p{C}Other.
    \p{Cc}Other, control.
    \p{Cf}Other, format.
    \p{Co}Other, private use.
    \p{Cs}Other, surrogate.
    \p{L}Letter.
    \p{LC}Letter, cased.
    \p{Ll}Letter, lowercase.
    \p{Lm}Letter, modifier.
    \p{Lo}Letter, other.
    \p{Lt}Letter, titlecase.
    \p{Lu}Letter, uppercase.
    \p{M}Mark.
    \p{Mc}Mark, space combining.
    \p{Me}Mark, enclosing.
    \p{Mn}Mark, nonspacing.
    \p{N}Number.
    \p{Nd}Number, decimal digit.
    \p{Nl}Number, letter.
    \p{No}Number, other.
    \p{P}Punctuation.
    \p{Pc}Punctiation, connector.
    \p{Pd}Punctuation, dash.
    \p{Pe}Punctuation, close.
    \p{Pf}Punctuation, final quote.
    \p{Pi}Punctuation, initial quote.
    \p{Po}Punctuation, other.
    \p{Ps}Punctuation, open.
    \p{S}Symbol.
    \p{Sc}Symbol, currency.
    \p{Sk}Symbol, modifier.
    \p{Sm}Symbol, math.
    \p{So}Symbol, other.
    \p{Z}Separator.
    \p{Zl}Separator, line.
    \p{Zp}Separator, paragraph.
    \p{Zs}Separator, space.

    These character classes are only available, if the option --enable-parle-utf32 was passed at the compilation time.

    Alternation and repetition

    Alternation and repetition
    SequenceGreedyDescription
    ...|...-Try sub-patterns in alternation.
    *yesMatch 0 or more times.
    +yesMatch 1 or more times.
    ?yesMatch 0 or 1 times.
    {n}noMatch exactly n times.
    {n,}yesMatch at least n times.
    {n,m}yesMatch at least n times but no more than m times.
    *?noMatch 0 or more times.
    +?noMatch 1 or more times.
    ??noMatch 0 or 1 times.
    {n,}?noMatch at least n times.
    {n,m}?noMatch at least n times but no more than m times.
    {MACRO}-Include the regex MACRO in the current regex.

    Anchors

    Anchors
    SequenceDescription
    ^Start of string or after a newline.
    $End of string or before a newline.

    Grouping

    Grouping
    Sequence Description
    (...) Group a regular expression to override default operator precedence.
    (?r-s:pattern) Apply option r and omit option s while interpreting pattern. Options may be zero or more of the characters i, s, or x. i means case-insensitive. -i means case-sensitive.