Follow-up Comment #1, bug #24438 (project grep):
I just ran into this bug as well, and I can offer a little more information.
$ export LANG=en_US.UTF-8
$ grep --version | head -n1
GNU grep 2.5.3
$ echo 'Foo Foo' | grep -i foo
$ echo 'Foo foo' | grep -i foo
Foo foo
$ echo 'foo Foo' | grep -i foo
foo Foo
$ echo 'Foo Foo' | grep -io foo
$ echo 'Foo foo' | grep -io foo
Foo
foo
$ echo 'foo Foo' | grep -io foo
foo
Foo
So it appears that the line has to contain at least one case-sensitive match
in order for any matches to be output at all. But if it does contain at least
one case-sensitive match, then all case-insensitive matches are output.
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