validation.js

const regexEmail = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
export const validateEmail = (email) => {
  let error = '';

  if (!email) {
    error = 'Required';
  } else if (!regexEmail.test(email)) {
    error = 'Invalid email address';
  }

  return error;
};

const regexName = /^([ \u00c0-\u01ffa-zA-Z'-])+$/;
export const validateName = (name, checkIfEmpty) => {
  const nameString = String(name || '');
  let error = '';

  if (checkIfEmpty && nameString.length <= 0) {
    error = 'Required';
  } else if (!regexName.exec(nameString)) {
    error = 'Only letters, -, and \' are acceptible';
  }

  return error;
};