var validationSet = {
  'first_name': {
    'regexp': /^.+?/,
    'error': 'Please select a First Name. '
  },
  'last_name': {
    'regexp': /^.+?/,
    'error': 'Please enter a Last Name. '
  },
  'email': {
    'regexp': /^.+?@.+?\..+$/,
    'error': 'Please enter a valid email address. ' +
        'It should be of the form someone@example.com.'
  }
};