letters or numbers only in a password with jquery

I found this co开发者_开发问答de for alphanumeric check ("Letters, numbers, spaces or underscores") but I want to change so I will be able to write only letters or numbers. Can anyone tell me how to change this code:

function(value, element) {
    return this.optional(element) || /^\w+$/i.test(value);}

Thanks!

Greg

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This should do it:

function(value, element)
{
    return this.optional(element) || /^[a-zA-Z0-9]+$/i.test(value);
}

EDIT: OK, no idea why I can't get that formatting nicely, but the important part is replacing the \w with the character class (the bit in []).

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I've used this for years now :

http://www.itgroup.com.ph/alphanumeric/

Take a look