my ($flags)    = $filename  =~ / \. ([0-9a-fA-F]+) $ /x;

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[0-9a-fA-F] is also available (and, IMHO, preferable) as the  [[:xdigit:]] POSIX character class. See POSIX Character Classes in perlre for info on this and its many Unicode  \p{Property} cousins.

In reply to Re^2: How do I test if a bit has been set in a bitstring by AnomalousMonk
in thread How do I test if a bit has been set in a bitstring by willk1980

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