Question

I have the following code block for validation in PHP and I can’t figure out why my validation is still failing. I am a newbie to regular expressions but I want to allow for ($ , . -) but it isn’t working. I started out with “[A-Za-z0-9]”. The only character that is allowed with the below code is the dash (-) but not $ or . or , or space. Can someone point me in the right direction?

case 'alnum':
{
        $bret= $this->test_datatype($input_value,"[A-Za-z0-9\s$,.-]");
        if(false == $bret) {
            $default_error_message = sprintf(E_VAL_ALNUM_CHECK_FAILED,$variable_name);
        }
    break;
                            }

Answer 1

You can use backslash before characters that are not working i.e. $ etc.

$bret= $this->test_datatype($input_value,"[A-Za-z0-9\s\$\,\.-]");