How to load only on a page with certain word ending, but not subpages

Hello,

How to write the regex to offload a plugin for all pages, but to load only on pages that ends with certain keyword.. but not the subpages of that..

for example;

page 1: https://domain.com/contact-us/

page 2: https://domain.com/contact-us/thank-you/

page 3: https://domain.com/contact-us/thank-you/visit-again/

I want to offload a plugin on all pages but want to load on page2, thank-you page only.

When I am using /thank-you/ or #/thank-you/#, in both cases, the plugin is loading for both page2, and page3… but I want it to load only on page2 and not on page1, and page 3..

Please help.