KDevelop 5.x documentation for Find-Replace in Files

I'm trying to search and replace in files using regular expressions by using the "Find-Replace In Files" dialog of [KDevelop 5.x](https://www.kdevelop.org/) . Where can I find the documentation for this? The user interface for Find/Replace is vastly different from other IDE's I've used (eg. Eclipse): - Instead of having a Search-for text box that I can type a RegExp into, it has a Pattern text box and a Template text box. The Template text box appears to have printf-style format options. - It doesn't have a Replace-with text box, instead it has a Replacement Template text box that, again, appears to have printf-style format options. KDevelop's link for documentation links to the [KDevelop Wiki](https://userbase.kde.org/KDevelop4) , which doesn't have anything about this, unless I missed it. If there is no documentation, a link to the relevant source code along with a summary of the relevant portions will suffice.