Case sensitive : Toggles case sensitive searches.
Regular expression : Determines whether Pattern can use regular expressions. I'm unaware if there's other special '%' references that can be used, and '%s' is not required to be used. What you put in that Replacement text field is what '%s' will expand to. Questionably, the KDevelop team decided to put the Replacement text field in another dock (see next image below). Replacement template : A pattern (not regular expression enabled) to decorate your replacement string with. To the right of this field is a drop down menu for various predefined templates you can use. KDevelop will then search for text that matches 'foofoo', left associative. If your Pattern is set to 'foo', then a Template pattern of '%s%s' will expand to 'foofoo'. The '%s' is a reference to the string you typed in Pattern. Template : A regular expression to decorate your search string with. It can support regular expressions, but only when the Regular expression checkbox is checked. Pattern : This string is what you're looking for. In the Find-Replace dialog (above), we have these fields: Note however I am not a Kdevelop developer nor have I looked at the source code, I'm just reporting what I've learned through trial and error, and I unfortunately don't have a complete understanding of the Find-Replace In Files functionality. After hitting search, type 'foobar' without quotes in the Replacement text field in the dock and hit the Replace button. You can type: 'vector' without quotes in the Pattern field, type '(%s)' without quotes in the Template field, and '' without quotes in the Replacement Template field. Example, say you want to replace (vector) with "foobar" in your documents. You can do all sorts of patterns in these fields. For the Replacement Template field, it refers to the string you type into the "Replacement text:" field, which will appear in the "Find/Replace in Files" dock that appears in the bottom of the IDE when you click on the search button. 
The %s in the Template field refers to the string you type in the Pattern field. The %s refers to two different fields in the Template and Replacement Template fields.
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