I'm surprised that everyone (including the FAQ) missed the most obvious solution which uses an alternation. Most other solutions seem to forget that the $ anchor is right before the trailing newline. :)
$string =~ s/^\s+|\s+$//gm;
If you want to preserve blank lines, it's a tiny bit longer.
s/^[\t\f ]+|[\t\f ]+$//mg;
Remember: in Perl, the common things are supposed to be easy, so if you're doing something common and it's not easy, you're probably missing something. :)
I'm going to update the FAQ answer too.
brian d foy <email@example.com>
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