s/00/90/g s/.\B/&&&&&&&&&&/g : s/[2-9]/&1/g y/23456789/12345678/ t s/ //3 s/110\? \(1*\)/1 \10\1\100/ t s/0//g / \(1*\) \1/cFail cPass
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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