Re: Looking for an easier regex check...

On Mon, 29 Apr 2002, Joshua E Minnie wrote: > Does anybody know of a good way to make sure that a string contains ONLY > certain characters. I tried using > ereg("[~`!@#$%^&*(){}-+=|\\/.,<>'\":;\[\]]", $string); but I get > parse > errors. I'm surprised you get a parse error. I'd expect you would get a runtime error like REG_ERANGE. Anyway, you need to escape all the characters that have special meanings in regular expressions. Try something like: ereg("[~!@#\$%^&\*(){}\-\+=|\\/\.,<>'\":;\[\]a-zA-Z0-9]", $string); > Besides that I only want the characters A-Za-z0-9_ in $string. Is there > is simpler way to ensure this rather than checking to see if any of the > characters I don't want are in there? miguel