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<?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 for git.master, git.master_jit, rfc.property-hooks
int(1) array(1) { [0]=> string(2) "rn" } Warning: Undefined variable $m2 in /in/HLtF2 on line 7 Warning: Undefined variable $m2 in /in/HLtF2 on line 7 int(0) NULL NULL

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