s/\b\w\b/0&/g s/100/:0/g s/ .. /<&>/ : s/[1-:]/&-/g y/123456789:/0123456789/ s/0\(-*\) 0\(\S*\)/\2\1/ t s/-*0/&&&&&&&&&&/g s/0//g :0 s/-\(-< \(-*\) >\)\2\2\?/\1/ t0 / \(-*\) >\1/cFail cPass
Note that non-ascii characters in the above source code will be escaped (such as \x9f).