note 39792 added to function.preg-match

Concerning a list of notes started on November 11; ie <? $num="([0-9]|1?\d\d|2[0-4]\d|25[0-5])"; ?> It is interesting to note that the pattern matching is done using precedence from left to right, therefore; an address such as 127.0.0.127 sent to preg_match with a hash for the matched patterns would return 127.0.0.1. so, to obtain a proper mechanism for stripping valid IPs from a string (any string that is) one would have to use: <? function valid_ipv4($ip_addr) { $num="(1?\d\d|2[0-4]\d|25[0-5]|[0-9])"; $range="([1-9]|1\d|2\d|3[0-2])"; if(preg_match("/$num\.$num\.$num\.$num/",$ip_addr,$matches)) { return $matches[0]; } else { return false; } } ?> thanks for all the postings ! They're the best way to learn. ---- Manual Page -- http://www.php.net/manual/en/function.preg-match.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+39792 Delete -- http://master.php.net/manage/user-notes.php?action=delete+39792&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+39792&report=yes Search -- http://master.php.net/manage/user-notes.php