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<?php var_dump(preg_replace('#.*_([a-z])+\.(?jpg|gif|png|jpeg)$#','_n','http://photos-h.ak.fbcdn.net/hphotos-ak-frc3/t1.0-0/1538683_705144079517314_1930601228_n.jpg', 1));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: unrecognized character after (? or (?- at offset 15 in /in/gb03Z on line 3 NULL

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