* validateEmail
  * @param email, email address
  * @return boolean, if email valid
private static boolean validateEmail (string email) {
    string emailRegex = '^[a-zA-Z0-9._|\\\\%#~`=?&/$^*!}{+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4}$';
    pattern outPattern = pattern.compile(emailRegex);
    matcher outMatcher = outPattern.matcher(email);
    return outMatcher.matches();	
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