PHP Regular Expression validation

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;
                            }

You should use preg_match right there and not obfuscate it with an interception method. (Which, its inner workings being unknown, makes this hard to answer). The false== comparison is also super redundant. — mario
– mario, Commented Apr 7, 2012 at 3:43

sarwar026 · Accepted Answer · 2012-04-07 03:39:53Z

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\$\,\.-]");

answered Apr 7, 2012 at 3:39

sarwar026

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