Cute. It makes the assumption, however, that there is a unique point
where that equivalence occurs. I don't think that this is correct:
whenever you split in the middle of an environment variable name,
you'll get a nonmatch that can turn into a match if you happen to look
further.
What about doing a linear scan from the end? It might be too
slow...but it might be perfectly fast enough. It is sufficient
to test places where there is a /, ~, or $. There usually
won't be many of them.
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