How to direct the search to pages only?

I’m afraid that’s not quite how the plugin (or strings) functions.

Since the strings used in a page could be defined anywhere: they could be included from another file, preset in a functions file, and so on.

The best approach would be to direct the search to the theme or plugin you expect it to be within (the search it self doesn’t take much time), so you don’t accidentally miss out on the strings because your expectation of the string location was incorrect ??