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$post =~ s!\Q:-\\E!<img src="./emoticons/what.gif">!gio;
$post =~ s!\Q:\\E!<img src="./emoticons/what.gif">!gio;

Array loaded with 84 posts.
Begin benchmark.
                   Rate should_be_slower should_be_faster
should_be_slower 1331/s               --             -14%
should_be_faster 1552/s              17%               --