note 57929 added to ref.regex

That's a cool regex, but it has a catch, matches strings like this: 555)123 4567 A possible workaround could be: <?php if((strpos($string, '(') !== false && strpos($string, ')') === false) || (strpos($string, '(') === false && strpos($string, ')') !== false)) { echo "You're missing a bracket."; } ?> ---- Manual Page -- http://www.php.net/manual/en/ref.regex.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+57929 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+57929&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+57929&report=yes Search -- http://master.php.net/manage/user-notes.php