global: regular expression is not allowed with the --from-here option.

[Leo Liu]

In a scheme (language) project where there are many tags with ?, I am
constantly getting:

        $ global --from-here=40:guix.scm %gcc-bootstrap-tarball?
        global: regular expression is not allowed with the --from-here option.

Isn't it better to treat the pattern as literal instead of an error. One
can get the same error from `completion' (i.e. -c) by using any regexp
metachar(?$+. etc). Could this error be removed and replaced with
something that does the right thing?

Thanks,
Leo