I'm still surprised that Perl can match against '/' several times (split) faster than it can skip to the last '/' with a single rather simple match.
I'm not surprised. /(^\/+)\z/ is a rather
complicated regex due to the character class being used. The
optimizer can't figure out that is the same as "looking for
the last slash". m!/! on the other hand is so simple,
the optimizer recognizes it as searching for a fixed string.
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