* John Nichel <[EMAIL PROTECTED]>:
> 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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