@roblourens ,
Replace string functionality in search does not work properly for hyphen and underscore separated variables , Initially figured it out from this comment
Example:

• ReplacingFoo-Barto test-replace with preserve case turned on replaces correctly to Test-Replace
• Replacing foo-Bar to test-replace with preserve case turned on replaces incorrectly to test-replace instead of test-Replace

PS : Additional Info from the code
I found out there is a bug in buildReplaceStringWithCasePreserved function.
The whole idea to call the replacement function again at this line was to reuse the already existing replacement logic ( First char capital , full caps and full small) but there was a bug as the hyphens and underscores were not even called because of wrong ordering in the condition checking logic.