Follow-up Comment #1, bug #59000 (project grub):
Actually, doing a test in grub-emu, I get:
grub> foo="-gentoo" ; regexp --set=1:bah '^(.*)$' "$foo" ; echo $bah
error: unknown argument `-g'.
(Of course the regex in this case is trivial for testing. The real one was
something like '^([^[:digit:]]*)([[:digit:]]*)(.*)$' but that doesn't affect
the command parsing.)
Either regexp should always treat the last two arguments as pattern and
string, and avoid parsing them as parameters, or introduce a couple of long
options, say
regexp ... --pattern="foo" --string="bah"
as an alternative to positional parameters.
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