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On Mon, Jul 27, 2015 at 12:28 AM, Sean Conner <sean@conman.org> wrote:

> (You may have to switch to LPEG ... )

Perhaps not.

print ( ('d//'):gsub ( '([^/])/*$', '%1/' ) )

print ( ('d//'):gsub ( '/*$', '/', 1 ) )

-Parke