print"$f-",substr($s,length+(("$f"^"$s")=~/(\0*)/)[0]),"\n";

[download]
can be reduced to 
print"$f-",substr($s,/\0*/g&&pos),"\n"for("$f"^"$s");

[download]

In reply to Golf: eliding number ranges by Roy Johnson
in thread eliding number ranges by qq

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