i think mischief is onto something. when you find yourself going slightly loopy in complex code, it's often an indication to refactor design. as a lot of time it's not super ingenious code that "wins"; simpler code with a simple interface is often more flexible in the long run.
processing the input to produce a internal representation in ISO units or other consistent units, allows good flexibility.
if you're interested following that path, have a look (and infer the logic) on unit conversion apps such as those for iphone.
the hardest line to type correctly is: stty erase ^H

In reply to Re^2: Global replace issue by aquarium
in thread Global replace issue by Anonymous Monk

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