preprocess
Drupal 7 notes: node or page template by path
Because I always seem to manage to completely forget how to do something this basic.
template.php
in theme_preprocess_page(&$variables)
or theme_preprocess_node(&$variables)
<?php
$path = drupal_get_path_alias();
if (strpos($path, 'part_of_url') !== false) {
$variables['theme_hook_suggestion'] = 'page__whatever'; // or node__whatever if using in a node preprocess
}
?>
This work is marked with CC0 1.0 Universal