Validate email address

/**
  * getAllAllowedFieldsForCurrentUser
  * @param objectAPI, Object Api Name
  * @return String.join(fieldList, ','), all the fields concatened, separated by ","
  */
private static string getAllAllowedFieldsForCurrentUser (string objectAPI) {
    return string.join(new List<String>(Schema.getGlobalDescribe().get(objectAPI).getDescribe().fields.getMap().keySet()), ',');
}

/**
  * 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();	
}