Email Validation using Javascript

if(!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,5})+$/.test(affiliate.email.value))){

      alert("Please enter Valid Email Address");

      affiliate.email.focus();

      return false;

  }

in the above case 'affiliate' is the form name & 'email' is the textbox name to test.