Oh, you're right! I missed the dollar sign! That makes it even worse! Unless V8 converts the regex to that expression (which it could maybe do, but I doubt), th

Oh, you're right! I missed the dollar sign! That makes it even worse! Unless V8 converts the regex to that expression (which it could maybe do, but I doubt), there's no way the regex version could be anything like as fast. Your version has the added benefit of also being far more readable and totally without any kind of memory allocation. Extraordinary package, this.