regex perf optimizations

[quantizor]

Should fix #228

[codecov]

Codecov Report

Merging #229 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   99.72%   99.72%           
=======================================
  Files           1        1           
  Lines         363      363           
  Branches       57       57           
=======================================
  Hits          362      362           
  Misses          1        1

Impacted Files	Coverage Δ
index.js	99.72% <100%> (ø)	⬆️

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