It could be interesting if the clipboard manager could replace text.

Feature Requests
1

For example change

www.reddit.com/r/Stuff

to

old.reddit.com/r/Stuff

or

https://en.m.wikipedia.org/wiki/Example

to

https://en.wikipedia.org/wiki/Example

2

Have a look here: http://docs.bettertouchtool.net/docs/8c_text_transformer_functions.html

You can configure text transformer functions in the "Named & Other Triggers" section in BTT.