[RESOLVED] string reg ex

[Sayian]

Hello,

Im trying to come up with a function to check if a string is valid or not.

Allowing only a-z A-Z 0-9 _ and -

so far, ive experimented with the normal [a-zA-Z0-9] but how could i add _ and - to that. And whats the best way? pregmatch? or eregi?

Im new to regex, so please excuse me for not knowing all the correct terms.

function is_valid_cred($var) {
if(validation would go here) {
return true;
} else {
return false;
}
}

Thanks for help on this matter.

[gammaster]

Hi!
preg_match is faster than eregi. Your pattern should be like this:

$pattern = '/^[a-zA-Z\-_]+$/';

if(preg_match($pattern, $stringToCheck))
   return true;
else
   return false;

[gammaster]

Sorry but i forgot the numbers.

$pattern = '/^[a-zA-Z0-9\-_]+$/';