validate.js

  validateName(name: String) {
    if (name) {
      if (/^[A-Za-z0-9][a-z0-9._\-]*$/.exec(name)) {
        return true;
      }
    }
    return false;
  }

  validateEmail(email: String) {
    var re = /^(([^<>()\[\]\\.,;:\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,}))$/;
    return re.test(email);
  }

  validatePassword(password: String) {
    if (password) {
      if (password.length < 5) {
        return false;
      }
      if (password === 'Password must be at least 5 characters') {
        return false;
      }
      if (/^[A-Za-z0-9][a-z0-9._\-]*$/.exec(password)) {
        return true;
      }
    }
    return false;
  }