Both my solutions (below) treat every dot-followed-by-things-that-are-word-chars-but-arent-just-numbers as extensions, so they'll get both your cases pkg-5.6.tar.gz and pkg-5.6-win32.zip right
[]s, HTH, Massa

In reply to Re^3: Splitting an url in its components by massa
in thread Splitting an url in its components by baurel

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