Fix missing extracted classes containing . in Clojure

[RobinMalfait]

This PR fixes an issue in the Clojure pre-processor where candidates including . characters were not extracted correctly.

The solution here is to only replace the . with a when the . is not surrounded by numbers. This means that:

:.foo.bar

Becomes

: foo bar

But

:.gap-1.5.flex

Becomes

: gap-1.5 flex

This way the gap-1.5 is correctly extracted.

Test plan

1. Added a test for this case
2. Tested this in the extractor tool as well. Notice how the gap-1.5 is correctly extracted here.

Fixes: #17760