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@ 2013-11-04T23:05:41Z

<?php

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

var_dump(preg_match($r1, "rrn", $m1), $m1);
var_dump(preg_match($r2, "rrn"), $m2, $m2);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

42.68 ms | 402 KiB | 5 Q