AJJ AJJ - 1 year ago 114
Javascript Question

Special character validation

I have some javascript written to validate that a string is alphanumeric but i was just wondering how i could add some code to include hyphens(-) and slash's(/) as acceptable inputs. Here is my current code:

function validateAddress() {
var address = document.getElementById('address');

if (address.value == "") {
alert("Address must be filled out");
return false;
} else if (document.getElementById('address').value.length > 150) {
alert("Address cannot be more than 150 characters");
return false;
} else if (/[^a-zA-Z0-9\-\/]/.test(address)) {
alert('Address can only contain alphanumeric characters, hyphens(-) and back slashs(\)');
return false;

Answer Source

Simply add them to the character group. Of course, because both - and / are special characters in this context (/ ends a RegExp, - expresses a range), you'll need to escape them with a preceding \:

function validateAddress(){
    var TCode = document.getElementById('address').value;

    if( /[^a-zA-Z0-9\-\/]/.test( TCode ) ) {
        alert('Input is not alphanumeric');
        return false;

    return true;     
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