wp-includes/class-wp-rewrite.php:691Retrieves the search permalink structure.
string|false public function get_search_permastruct() { if ( isset( $this->search_structure ) ) { return $this->search_structure; } if ( empty( $this->permalink_structure ) ) { $this->search_structure = ''; return false; } $this->search_structure = $this->root . $this->search_base . '/%search%'; return $this->search_structure; }Introduced in 1.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-rewrite.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.