How to check for alphanumeric characters

Question

I\'m writing a custom method for a jQuery plugin:

jQuery.validator.addMethod(\"alphanumeric\", function(value, element) {
        return this.optional(elemen         


        

Answer 1

You can use regexes in JavaScript:

if( yourstring.match(/^[a-zA-Z0-9]+/) ) {
     return true
}

Note that I used + instead of *. With * it would return true if the string was empty