note 92443 added to function.preg-replace

Maybe it's better to avoid using \w and \W character class matches because they behave differently depending on locale server settings, therefore you will end up with a regular expression match that changes its behavior depending upon server settings. <?php /* according to most websites the regexp sintax [\w] is identical to [A-Za-z0-9_] See: http://en.wikipedia.org/wiki/Regular_expression http://msdn.microsoft.com/en-us/library/1400241x(VS.85).aspx */ $result1 = preg_replace('/[A-Za-z0-9_]*/', '', "test àèìòù test"); $result2 = preg_replace('/\w*/', '', "test àèìòù test"); echo "<pre>[" . $result1 . "]</pre>"; //ok, it shows: "[ àèìòù ]" echo "<pre>[" . $result2 . "]</pre>"; //WARNING on server other than UK/US locale, it shows: "[ ]" /* Why does this happen? preg_replace uses Perl Compatible Regular Expressions and NOT POSIX regular exp sintax. Therefore a minor difference is that in the former one the \w charcater class matches also the accented characters depending on locale settings. See: http://perldoc.perl.org/perlre.html#Regular-Expressions */ ?> ---- Server IP: 213.92.11.19 Probable Submitter: 151.16.81.68 ---- Manual Page -- http://www.php.net/manual/en/function.preg-replace.php Edit -- https://master.php.net/note/edit/92443 Del: integrated -- https://master.php.net/note/delete/92443/integrated Del: useless -- https://master.php.net/note/delete/92443/useless Del: bad code -- https://master.php.net/note/delete/92443/bad+code Del: spam -- https://master.php.net/note/delete/92443/spam Del: non-english -- https://master.php.net/note/delete/92443/non-english Del: in docs -- https://master.php.net/note/delete/92443/in+docs Del: other reasons-- https://master.php.net/note/delete/92443 Reject -- https://master.php.net/note/reject/92443 Search -- https://master.php.net/manage/user-notes.php