1 node.pages.inc node_autocomplete_validate($string)

Node title validation handler.

Validate handler to convert our string like "Some node title [3325]" into a nid.

In case the user did not actually use the autocomplete or have a valid string there, we'll try to look up a result anyway giving it our best guess.

Since the user chose a unique node, we must now use the same one in our submit handler, which means we need to look in the string for the nid.


$string: The string to validate.

Return value

$nid: A node ID if matched, or NULL if no match.

See also



core/modules/node/node.pages.inc, line 1092
Callbacks for adding, editing, and deleting content and managing revisions.


function node_autocomplete_validate($string) {
  $matches = array();
  $nid = 0;

  // This preg_match() looks for the last pattern like [33334] and if found
  // extracts the numeric portion.
  $result = preg_match('/\[([0-9]+)\]$/', $string, $matches);
  if ($result > 0) {
    // If $result is nonzero, we found a match and can use it as the index into
    // $matches.
    $nid = $matches[$result];
    // Verify that it's a valid nid.
    $node = node_load($nid);
    if (empty($node)) {
      return NULL;
  // If the input was numeric, check that it matches a node.
  elseif (is_numeric($string) && node_load($string)) {
    $nid = (int) $string;
  // Check that the user may have directly entered a node title.
  else {
    $nid = db_select('node')
      ->fields('node', array('nid'))
      ->condition('title', db_like($string) . '%', 'LIKE')
      ->range(0, 1)

  return (!empty($nid)) ? $nid : NULL;