rewrite regexp to split function

[sokra]

fixes #131

[codecov]

Codecov Report

Merging #142 (d6f17d6) into main (dccca06) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   93.72%   93.82%   +0.09%     
==========================================
  Files          22       23       +1     
  Lines        1625     1651      +26     
  Branches      469      480      +11     
==========================================
+ Hits         1523     1549      +26     
  Misses         95       95              
  Partials        7        7              

Flag	Coverage Δ
integration	93.82% <100.00%> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
lib/ConcatSource.js	92.57% <ø> (ø)
lib/OriginalSource.js	95.89% <100.00%> (ø)
lib/helpers/splitIntoPotentialTokens.js	100.00% <100.00%> (ø)

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