note 103015 added to function.preg-match

Sometimes its useful to negate a string. The first method which comes to mind to do this is: [^(string)] but this of course won't work. There is a solution, but it is not very well known. This is the simple piece of code on how a negation of a string is done: (?:(?!string).) ?: makes a subpattern (see http://www.php.net/manual/en/regexp.reference.subpatterns.php) and ?! is a negative look ahead. You put the negative look ahead in front of the dot because you want the regex engine to first check if there is an occurrence of the string you are negating. Only if it is not there, you want to match an arbitrary character. Hope this helps some ppl. ---- Server IP: 213.249.64.162 Probable Submitter: 83.117.87.253 ---- Manual Page -- http://www.php.net/manual/en/function.preg-match.php Edit -- https://master.php.net/note/edit/103015 Del: integrated -- https://master.php.net/note/delete/103015/integrated Del: useless -- https://master.php.net/note/delete/103015/useless Del: bad code -- https://master.php.net/note/delete/103015/bad+code Del: spam -- https://master.php.net/note/delete/103015/spam Del: non-english -- https://master.php.net/note/delete/103015/non-english Del: in docs -- https://master.php.net/note/delete/103015/in+docs Del: other reasons-- https://master.php.net/note/delete/103015 Reject -- https://master.php.net/note/reject/103015 Search -- https://master.php.net/manage/user-notes.php