Strip special characters with jQuery form validation

i was using a jquery form validation plugin and it was so easy in validating a form. I was stuck in a scenario where i want users to register userID and i dont want them to enter special characters like dots and just want them to enter alphabets, number and underscore in the username.

I went through the documentation of the plugin and there was no such methods to strip the special characters in the plugin.
Finally, i somehow got hold of the code that does the job through regular expression regex that checks for only numbers and a-z

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<script> $(document).ready(function(){     $.validator.addMethod("noSpecialChars", function(value, element) {       return this.optional(element) || /^[a-z0-9\_]+$/i.test(value);   }, "Username must contain only letters, numbers, or underscore.");   $("#myForm").validate(); }); </script>

All you have to do is call this function from the textbox element.

1 2	//call this from html code within class=required <input id="cname" name="name" size="25" class="required noSpecialChars" minlength="2" />

Works like a charm!