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
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