simple regular expression help?

[doubledown]

Hi, I've been trying to write a regular expression that checks to make sure a string contains only numbers and letters, no other characters, if someone has one of these already written could you please post an example i could use?

Thank you,

[trexx]

how about...

echo preg_match('/^[0-9a-z]*$/i', $myString) ? 'true' : 'false';

[bAAGi]

Or...

if(ereg("^[:alnum:]+$",$string)) { echo "yep"; }

or

if(ereg("^[0-9A-Za-z]+$",$string)) { echo "yep"; }

or

if(eregi("^[0-9a-z]+$",$string)) { echo "yep"; }