Online PHP editor | refs for u8LG5

<?php $s = "# (1296) {20} [529] [1496] [411]\n# (MONDAY ) (1296)\n# (646) {20} (BEACH 7) [20 Mtrs] { 03 Foot }\n# {19} [455] [721] (1296) (SUNDAY ) [2741] (MONDAY (WEDNESDAY {20}\n# {19} (1296)"; if (preg_match_all('~^#|(?:(\[)|($)|{)\d+(?(1)]|(?(2)$|}))~m', $s, $m)) { echo preg_replace_callback('~^(#)\s*|#\s*~', function($m) { return isset($m[1]) ? "#" : "\n#"; }, implode(" ", $m[0])); }