Plugin not working

Hello people,

I’m trying to replace the URLs below, but the server is crashing:

search for: https://sub.mysite.com.br/author/jammy-hanters/
replace with: https://sub.mysite.com.br/author/jamhanters/

What can be happening?

And will the replacement of the above URLs work or will the plugin only work to replace the root domain?

Thanks!