CODEWITHSUNDEEP
phpregexvalidationpreg-match
Cool
Cool

Reputation: 348

How to validate phone field?

How can I validate phone field for below format:

(999) 999-9999

I have tried with below, but not working.

if(array_key_exists('phone', $values) && $values['phone'] != '')
{
  if(!preg_match('/^[0-9]{3}-[0-9]{3}-[0-9]{4}$/', $values['phone']))
  {
    $form_state->setErrorByName('phone', t('Please enter a valid phone number.'));
  }
}

Upvotes: 2

Views: 231

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627056

You almost did it: the {3} should quantify the [0-9] and the literal parentheses should be added escaped with a backslash:

if(array_key_exists('phone', $values) && !empty($values['phone']))
  {
    if(!preg_match('/\A\([0-9]{3}\) [0-9]{3}-[0-9]{4}\z/', $values['phone']))
    {
      $form_state->setErrorByName('phone', t('Please enter a valid phone number.'));
    }
  }

I also suggest using !empty($values['phone']) and \A / \z anchors that always match the start / the very end of the string.

See the regex demo:

  • \A - unambiguous start of the string anchor
  • \( - an open parenthesis
  • [0-9]{3} - 3 digits
  • \) - a closing parenthesis
  • - a space
  • [0-9]{3} - 3 digits
  • - - a hyphen
  • [0-9]{4} - 4 digits
  • \z - the very end of the string.

Upvotes: 2

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