Tweak a couple of macros in the regex code to suppress compiler warnings
from "clang". The VERR changes make an assignment unconditional, which is probably easier to read/understand anyway, and one can hardly argue that it's worth shaving cycles off the case of reporting another error when one has already been detected. The INSIST change limits where that macro can be used, but not in a way that creates a problem for any existing call.
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