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 POSIX       trad. Perl  utf8 Perl

 [:^digit:]      \D      \P{IsDigit}
 [:^space:]      \S      \P{IsSpace}
 [:^word:]       \W      \P{IsWord}

See the utf8 manpage for details about `\pP', `\PP', and `\X'.

·   Named Unicode properties and block ranges make be used
    as character classes via the new `\p{}' (matches
...
    written `\pM' also.  Many predefined character classes
    are available, such as `\p{IsMirrored}' and
    `\p{InTibetan}'.