preg match for special chars

[brem13]

hey, i was wondering how i would make a preg match check for special characters, i would only like to allow an underscore _ and a dash -

i'm currently using

preg_match("/[^0-9]+$/",$getUser)

but thats not working right

[btherl]

If you have a list of characters to allow, just list those characters, eg

 

preg_match("/^[0-9a-zA-Z_-]+$/", $getUser);

 

That allows 0-9, a-z, A-Z, underscore and dash only.  Make sure the dash appears last or first, so it doesn't get mistaken for a range of characters.

[brem13]

thank you!