#!perl -lp s/\bx/1x/g;$_=join('+',map/x\^/?$_*$'.$&.($'-1):$_+0,/.*?x.?-?[\d.]*/g)||0;s/\+\B|\^1|\b1(?=x)//g
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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