Posted by Andy Hassall on 02/16/06 01:18

On Thu, 9 Feb 2006 14:02:04 -0800, "Jim Michaels" <jmichae3@nospam.yahoo.com>
wrote:

>>> How can I know if a string only has alfanumeric chars?
>
>give him an example!
>
>preg_match('/^[\w\d]$/', $string);

\w includes more than alphanumeric (it includes underscore), but includes all
of \d.

Alternatives could be:

/^[a-zA-Z\d]+$/

... or even ...

/^[^\W_]+$/

... for ASCII definitions of "alphanumeric", anyway.

--
Andy Hassall :: andy@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool

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