note 90315 deleted from function.preg-quote by thiago

Note Submitter: strata_ranger at hotmail dot com ---- 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); ?>