--TEST-- Bug #37911 (preg_replace_callback ignores named groups) --FILE-- blub)|', 'callback', 'bla blub blah')); var_dump(preg_match('|(?Pblub)|', 'bla blub blah', $m)); var_dump($m); var_dump(preg_replace_callback('|(?P<1>blub)|', 'callback', 'bla blub blah')); ?> --EXPECTF-- array(3) { [0]=> string(4) "blub" ["name"]=> string(4) "blub" [1]=> string(4) "blub" } string(15) "bla blub/4 blah" int(1) array(3) { [0]=> string(4) "blub" ["name"]=> string(4) "blub" [1]=> string(4) "blub" } Warning: preg_replace_callback(): Compilation failed: %s name must start with a non-digit at offset %d in %sbug37911.php on line %d NULL