Question

Possible Duplicate:
regular expression for letters, numbers and – _

I would like to return true if the $var only includes (A-Z, a-z, 0-9 and –)

Something like: (this preg_match is to check if $var is mail, but I need the above)

if (!preg_match("/^[-!#$%&\'*+\\.\/0-9=?A-Z^_`{|}~]+@([-0-9A-Z]+\.)+([0-9A-Z]){2,4}$/i", $var))
    return false;
return true;

Any ideas? Im new with preg_match.

Answer 1

You need to use this preg_match with the code you provided:

preg_match("/^[A-Z0-9-]+$/i", $var)

It will match if $var includes only (A-Z, a-z, 0-9 and -) and is at least 1 character long. If you want to match also empty strings turn the + in a *.