$2$3', $string); $string = preg_replace('#(^|[\n \-\*/\.])_(.+?)_($|[ \-\*/\.\!\?,])#is', '$1$2$3', $string); $string = preg_replace('#(^|[\n \-_\*\.])/(.+?)/($|[ \-_\*\.\!\?,])#is', '$1$2$3', $string); return nl2br($string); } }