What does "selecting 'python-clang-3.8' for regex 'clang-3.8'" mean?

I'm working on a Raspberry Pi 3. The device uses Raspbian, which is Debian derivative. I'm trying to install Clang 3.8 because Clang 3.7 appears to lack proper sanitizer support.

When I run the install command:

$ sudo apt-get install clang-3.8
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'python-clang-3.8' for regex 'clang-3.8'
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

$ clang-3.8
-bash: clang-3.8: command not found
$ clang
-bash: clang: command not found

$ find /usr/bin -name '*clang*'
$

What does "selecting 'python-clang-3.8' for regex 'clang-3.8'" mean?

What, exactly, is the regex being referred to?

Where is Clang after the install?

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