JavaScript Email Validation

This function validates email address format.
Function returns true if format is valid and false if format is invalid.

function validate(address /* as string */) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   if(reg.test(address) == false) {
      return false;
   }
      return true;
}

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