Derivative by murky-satyr

System.in.eachLine{o=''
it.eachMatch(/(.*?)x(\^(.[\d.]*))?/){p,a,q,b->int c=b?b.toFloat()*10:10
c=c-76?c:77
a=(int)((a-~/\D/?a:a+1).toFloat()*c)/10
c/=10
o&&a>0?o+='+':0
o+=--c?"$a"-~/\b1$/+(c-1?'x^'+c:'x'):a}
println o?:0}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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