[SOLVED] ereg

[taith]

sorry, i know very little of ereg... but i'm trying to make a function to determine if a string is a hex or not... heres what i got sofar...

 

function is_hex($string){
if($string{0}=="#") $string=substr($string,1);
if(strlen($string)!='6') return false;
if(!ereg("[a-fA-F0-9]", $string)) return false;
return true;
}
if(is_hex("#asdf89")) echo 'true';
else echo 'false';

 

any idea why it keeps returning true?

[effigy]

You're not using anchors or quantifiers; the expression is looking for one a-fA-F0-9 anywhere inside the string.

 

^[a-fA-F0-9]+$

[taith]

perfection! thanks :-D

[hitman6003]

if(!ereg("[a-fA-F0-9]{6}", $string))

 

Using that you could also eliminate the check for string length above the ereg call.