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

__output__

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

##</code><code>##

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

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

__output__

old - match
new - matching.com