Checking string for letters and numbers

[Anon]

Hi,

how can I check a string for weird characters,

I want a string to have only numbers (1234567890) or letters(aA / zZ)

Can I do it with a regex?

[polson]

Check out this tutorial :

http://phpbuilder.com/columns/dario19990616.php3

And try :

if ( eregi("^{[a-z0-9]+$",$string)} ) {

echo 'yes, alphanumeric';

} else {

echo 'nope, failed';

}

[Anon]

thank you....