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my $re = qr/(?:match|matching\.com|match.company)/i;
print "regexp - $re";
...
__output__

regexp - (?i-xsm:(?:match|matching\.com|match.company))

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my $re = qr/(match|matching\.com|match.company)/i;
print "old - $1\n" if "matching.com" =~ $re;
...

old - match
new - matching.com