[bug #31389] False positive due to apparent case insensivity

[Paolo Bonzini]

Follow-up Comment #3, bug #31389 (project grep):

It does, but you can simply export LC_COLLATE and LC_CTYPE with a value of
"POSIX" in your .bashrc (as well as at the top of shell scripts where you care
about this behavior) to override it.

Also, traditional [a-z] and [A-Z] can be represented portably as [[:lower:]]
and [[:upper:]] (and there's also [[:alpha:]] and [[:alnum:]] which come in
handy).

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