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<?php $str = '# (811) (1485) [2756] {29} [555] {15} # (811) (1476) {20} {15} (1485) [196] [2441] # (911) (619) {19} (1476) [2765] [2752] {21}'; echo preg_replace_callback('~ {(?!(?:19|20)})(\d+)}(?! *$)| *$~m', function($m) { static $rep = ''; $rep .= $m[0]; if ( !isset($m[1]) && [$ret, $rep] = [$rep, ''] ) return $ret; }, $str);
Output for git.master, git.master_jit, rfc.property-hooks
# (811) (1485) [2756] [555] {15} {29} # (811) (1476) {20} (1485) [196] [2441] {15} # (911) (619) {19} (1476) [2765] [2752] {21}

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