Added a test case for line-start regexes

[coordt]

Fixes #97

[github-actions]

Version hint: no-release
Current version: 0.15.1
New version (when merged): 0.15.1

_{Comment ID: Display the version hint-auto-generated}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6e1d63f) 93.05% compared to head (ef4823c) 93.05%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #107   +/-   ##
=======================================
  Coverage   93.05%   93.05%           
=======================================
  Files          19       19           
  Lines        1252     1252           
  Branches      257      257           
=======================================
  Hits         1165     1165           
  Misses         58       58           
  Partials       29       29           

Flag	Coverage Δ
python-3.10	93.05% <100.00%> (ø)
python-3.11	93.05% <100.00%> (ø)
python-3.8	93.05% <100.00%> (ø)
python-3.9	93.05% <100.00%> (ø)

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