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@ 2013-11-04T23:05:05Z

<?php

$r1 = '/(?!<r)rn/';
$r2 = '((?:rr(*SKIP)(*FAIL))rn)';

var_dump(preg_match($r1, "rn"));
var_dump(preg_match($r2, "rn"));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

53.98 ms | 402 KiB | 5 Q