XML Schema's pattern facet uses a regular expression language that supports [ Unicode]. It is fully described in [ XML Schema Part 2]. The language is similar to the regular expression language used in the Perl Programming language, although expressions are matched against entire lexical representations rather than user-scoped lexical representations such as line and paragraph. For this reason, the expression language does not contain the metacharacters ^ and $, although ^ is used to express exception, e.g. [^0-9]x.

regexTable2100%regex examples Table D1. Examples of Regular Expressions

11Expression	11Match(es)
11Chapter \d	11Chapter 0, Chapter 1, Chapter 2 ....
11Chapter\s\d	11Chapter followed by a single whitespace character (space, tab, newline, etc.), followed by a single digit
11Chapter\s\w	11Chapter followed by a single whitespace character (space, tab, newline, etc.), followed by a word character (XML 1.0 Letter or Digit)
11Espanñola	11Española
11\p{Lu}	11any uppercase character, the value of \p{} (e.g. "Lu") is defined by [Unicode]
11\p{IsGreek}	11any Greek character, the 'Is' construction may be applied to any block name (e.g. "Greek") as defined by [Unicode]
11\P{IsGreek}	11any non-Greek character, the 'Is' construction may be applied to any block name (e.g. "Greek") as defined by [Unicode]
11a*x	11x, ax, aax, aaax ....
11a?x	11ax, x
11a+x	11ax, aax, aaax ....
11(a\|b)+x	11ax, bx, aax, abx, bax, bbx, aaax, aabx, abax, abbx, baax, babx, bbax, bbbx, aaaax ....
11[abcde]x	11ax, bx, cx, dx, ex
11[a-e]x	11ax, bx, cx, dx, ex
11[\-ae]x	11-x, ax, ex
11[ae\-]x	11ax, ex, -x
11[^0-9]x	11any non-digit character followed by the character x
11\Dx	11any non-digit character followed by the character x
11.x	11any character followed by the character x
11.abc.	111x2abc, abc1x2, z3456abchooray ....
11ab{2}x	11abbx
11ab{2,4}x	11abbx, abbbx, abbbbx
11ab{2,}x	11abbx, abbbx, abbbbx ....
11(ab){2}x	11ababx

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Appendices

D Regular Expressions