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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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/[[:digit:]]/            # Matches a character that is a digit.
/[01[:lower:]]/          # Matches a character that is either a
                         # lowercase letter, or '0' or '1'.
/[[:digit:][:^xdigit:]]/ # Matches a character that can be anything
                         # except the letters 'a' to 'f'.  This is
                         # because the main character class is composed
                         # of two POSIX character classes that are ORed
                         # together, one that matches any digit, and
                         # the other that matches anything that isn't a
                         # hex digit.  The result matches all
                         # characters except the letters 'a' to 'f' and
                         # 'A' to 'F'.
ISBN 9781906966027Perl Language Reference ManualSee the print edition