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I've found several web pages that talk about how to set case sensitivity in searches in Kate. However, what I actually see on my screen doesn't match any of those pages. Here's a screen shot in which I'm using the the search and replace plugin:

And here's a screenshot of using just the built-in search:

Neither of those options look like they provide anywhere to set the case sensitivity of the search.

I'm using Kate version 16.12.3 with the KDE framework 5.31.0. Please let me know if there's any other info I should provide.

Any help on finding those options would be much appreciated.

The latest version is Kate 17.08.3. There's a switch to set case-sensitivity in the search dialog. You should update

So, with some great help from PiedPiper (thank you!) I found the answer to my question. The feature I wanted wasn't available in the version of Kate I was using. So I upgraded my entire system to Ubuntu 17.10 so I could get the latest Kate.

That version of Kate does have a case sensitivity button, but for some reason it's invisible. If you mouse over where it should be you'll get a little title box saying "Match Case". That's where the invisible button is sitting:

So the feature is there, you just have to know where the invisible button is.

I installed unity-tweak-tool and oxygen-icon-theme. When I ran unity-tweak-tool at the command line I got this:

terry@inspiron:~$ unity-tweak-tool

** (unity-tweak-tool:18598): WARNING **: Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
/usr/lib/python3/dist-packages/UnityTweakTool/__init__.py:40: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
 from gi.repository import Gtk
Error: schema com.canonical.notify-osd not installed
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

I tried to install com.canonical.notify-osd through Synaptic, which couldn't find any such package. At this point I've got what I need so I'll let this issue go, but thank you for the additional help!