jQuery validation plugin: accept only alphabetical characters?

Question

I\'d like to use jQuery\'s validation plugin to validate a field that only accepts alphabetical characters, but there doesn\'t seem to be a defined rule for it. I\'ve search

Answer 1

 $('.AlphabetsOnly').keypress(function (e) {
        var regex = new RegExp(/^[a-zA-Z\s]+$/);
        var str = String.fromCharCode(!e.charCode ? e.which : e.charCode);
        if (regex.test(str)) {
            return true;
        }
        else {
            e.preventDefault();
            return false;
        }
    });