I have a directory with some source files. A couple of files contains function headers like "filter(int)". In Dolphin, I press Ctrl-f, select "content", "From Here ...", and enter: filter( No results. When I enter: filter it shows a list of files that contains the search string.
That's because the filenamesearch ioslave uses regular expressions. If you type "filter\(" (without quotes) you will see the expected list of files. This is not user-friendly, indeed. We could add an additional query item to the filenamesearch URL that tells the ioslave whether the user wants to use regexes. Re-assigning to kio-extras for now, even though we'll also need a "Use regex" checkbox or toolbutton on the Dolphin side.