Right. However, one might not unreasonably claim that the Right Thing for qr to do is clean its input if it is given the output from another qr to avoid such messes.

UPDATE: Meanwhile, a possible solution is to uh, not nest qrs? ie; use the original strings to build up a single expression passed to qr. If anything, that ought to be simpler than using qr'd segments, and saves steps.

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I'm not belgian but I play one on TV.