Thank you very much! That clears it up.
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https://bugs.launchpad.net/bugs/2064905
Title:
Dubious output when using regex with apt-cache search
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Note the remark ", including virtual package names." in the manpage.
bindgen-0.65 has a "Provides: bindgen" (with a version), so it has
(also) the virtual package name "bindgen" and that perfectly matches
your regex. So, working as intended & documented and hence I am changing
the status to opinio