I would suggest one little change to the regexp:

while ($cmdline =~ s/%([^%-]+)-([^%]+)%/$config{lc $1}{lc $2}/eg)
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Of course it's not entirely equivalent. If your INI contained %foo-bar-baz%, then your regexp would match it like %(foo-bar)-(baz)% and mine as %(foo)-(bar-baz)%. I don't think it matters.

Jenda