Posted by Matthew Weier O'Phinney on 04/29/05 20:01

* John Nichel <john@kegworks.com>:
> Diana Castillo wrote:
> > what kind of a function can I use that will tell me whether a variable is
> > alphanumeric (that is has only characters A-Z or 1-9 )?
>
> Something like this should work. (untested)
>
> preg_match ( "/^([a-z]||[A-Z]||[0-9])+$/", $string )

It can be simpler than that, actually:

preg_match('/^[a-z0-9]+$/i', $string)

(tested and works)

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