Regex::PreSuf can combine a list of words into a more compact set of alternations and character classes: 
use Regex::PreSuf;

my $re = presuf(qw(foobar fooxar foozap));

# $re should be now 'foo(?:zap|[bx]ar)'

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-Mark

In reply to Re: build regexp on a list of patterns by kvale
in thread build regexp on a list of patterns by mod_alex

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