note 90315 added to function.preg-quote

In response to Frostschutz, the hyphen is not the only 'semi-special' character in PCRE that preg_quote doesn't modify. Remember, the hyphen is a special character /only/ when it occurs inside a character class (e.g. '[A-Z]'), if it occurs outside a character class it is treated literally. Two more 'semi-special' PCRE characters are: (space) and # -- If the PCRE_EXTENDED option is set, whitespace is ignored (outside of a character class) and # delimits comments. Since PCRE allows you to escape /any/ non-alphanumeric character via backslash, it could be nice if preg_quote() had an option to do the same. Of course, if that's what you need to do you can always do something like this: <?php // Escape any/all non-alphanumeric characters with a \ $string = preg_replace('/[^a-z\d]/i', '\$1', $string); ?> ---- Server IP: 69.147.83.197 Probable Submitter: 76.2.25.104 ---- Manual Page -- http://www.php.net/manual/en/function.preg-quote.php Edit -- https://master.php.net/note/edit/90315 Del: integrated -- https://master.php.net/note/delete/90315/integrated Del: useless -- https://master.php.net/note/delete/90315/useless Del: bad code -- https://master.php.net/note/delete/90315/bad+code Del: spam -- https://master.php.net/note/delete/90315/spam Del: non-english -- https://master.php.net/note/delete/90315/non-english Del: in docs -- https://master.php.net/note/delete/90315/in+docs Del: other reasons-- https://master.php.net/note/delete/90315 Reject -- https://master.php.net/note/reject/90315 Search -- https://master.php.net/manage/user-notes.php