[Bug 229925] [EXP-RUN] Disallow escaping ordinary characters in regex(3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229925

--- Comment #7 from Kyle Evans <kevans at freebsd.org> ---
(In reply to Antoine Brodin from comment #6)

Right, and it turns out escaping its use in the :C modifier is not necessary,
e.g. [1] removes the gratuitous escaping from these USES bits that caused that
particular breakage, and in theory works.

I'm doing some grep-work to see if I can pare down the amount of :C usage that
I need to whisk through to figure out what all breaks in the ports framework,
because it doesn't look as rampant as I had thought from some initial pokes.

Given that I don't quite have the resources to build the entire ports tree, do
you happen to have a smaller set of ports that you would recommend trying to
build on my own as a basic lemon test before asking you to try again? Perhaps a
small set that flexes quite a bit of ports functionality.

[1] https://people.freebsd.org/~kevans/escaped-colon.diff

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