/\/(\w+)\/foo$/

Perhaps better as:

m!/([^/]+)/foo$!

Advantages:

• Uses "choose your own quotes" to avoid falling-toothpick syndrome.
• Some systems allow some funky characters that \w won't match. However, '/' certainly won't be in a filename (unless something really, really weird happens).

----
I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident.
-- Schemer

Note: All code is untested, unless otherwise stated

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