Reg Exp always returning false value

Question

Hi,
Below is my code. I want to restrict the values to only alphabets and numbers and not special char.
But the below condition fails on a positive value also. Ex: ABCD, abcd, 1234. These should be acceptable.
Is the reg exp wrong?
private var special_char:RegExp = /^[A-Za-z0-9]*$/;
                              private function validateSpecialChar(inputValue:String):Boolean {
                                        if (special_char.test(inputValue))
                                                  valid = true;
                                        else
                                                  valid = false;
                                        return valid;
Thanks,
Imran

Answer 1

Try: http://stackoverflow.com/questions/9012387/regex-expression-only-numbers-and-characters