aeboi80 Posted January 11, 2011 Share Posted January 11, 2011 I have a keyword string which I need to verify only contains the following character set 0123456789abcdefghijklmnopqrstuvwxyz If it contains anything but 0123456789abcdefghijklmnopqrstuvwxyz then I need to mark it as invalid. if ($keyword contains ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()_+{}|":<>?/.,;'[]\=-){ $Error_msg = "invalid keyword"; } I don't really know much about preg_replace or similar functions...but I presume I would need to use something like that. I appreciate any guidance/examples. Quote Link to comment Share on other sites More sharing options...
Pikachu2000 Posted January 11, 2011 Share Posted January 11, 2011 This ought to point you down the right path. $string = 'abcdefghi12345A'; if(preg_match('~[^a-z0-9]~', $string) ) { echo 'Bad chars'; } Quote Link to comment Share on other sites More sharing options...
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