#element_validate callback for #pattern form element property.

Parameters

$element: An associative array containing the properties and children of the generic form element.

$form_state: The current state of the form.

array $complete_form: The complete form structure.

File

core/lib/Drupal/Core/Render/Element/FormElement.php, line 137

Class

FormElement

Provides a base class for form element plugins.

Namespace

Drupal\Core\Render\Element

Code

public static function validatePattern(&$element, FormStateInterface $form_state, &$complete_form) {
  if ($element['#value'] !== '') {
    // The pattern must match the entire string and should have the same
    // behavior as the RegExp object in ECMA 262.
    // - Use bracket-style delimiters to avoid introducing a special delimiter
    //   character like '/' that would have to be escaped.
    // - Put in brackets so that the pattern can't interfere with what's
    //   prepended and appended.
    $pattern = '{^(?:' . $element['#pattern'] . ')$}';
    if (!preg_match($pattern, $element['#value'])) {
      $form_state->setError($element, t('%name field is not in the right format.', [
        '%name' => $element['#title'],
      ]));
    }
  }
}

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