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   1. drupal6
   2. drupal7

As the search form collates keys from other modules hooked in via hook_form_alter, the validation takes place in _submit. search_form_validate() is used solely to set the 'processed_keys' form value for the basic search form.

Code

modules/search/search.pages.inc, line 113

<?php
function search_form_validate($form, &$form_state) {
  form_set_value($form['basic']['inline']['processed_keys'], trim($form_state['values']['keys']), $form_state);
}
?>