Javascript phone number validation

Question

I need to validate a phone number in javascript. The requirements are:

they should be 10 digits, no comma, no dashes, just the numbers, and not the

Answer 1

phone = phone.replace(/[^0-9]/g, '');
if(phone.length != 10) { 
   alert("not 10 digits");
} else {
  alert("yep, its 10 digits");
} 

This will validate and/or correct based on your requirements, removing all non-digits.