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    The following equivalences to Unicode \p{} constructs and equivale
+nt
    backslash character classes (if available), will hold:
...
        xdigit      IsXDigit

    <em>For example "[:lower:]" and "\p{IsLower}" are equivalent.</em>

#!/usr/bin/perl
use strict;
...
testing (?-xism:[[:lower:]]) and (?-xism:\p{IsLower})
testing (?-xism:[[:blank:]]) and (?-xism:\p{IsBlank})
testing (?-xism:[[:graph:]]) and (?-xism:\p{IsGraph})