[FIX] Restrict end of regex to prevent matches with non-date strings

[joweich]

Fixes #135

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.34%. Comparing base (c311cda) to head (878803c).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #136   +/-   ##
=======================================
  Coverage   90.34%   90.34%           
=======================================
  Files           1        1           
  Lines         259      259           
=======================================
  Hits          234      234           
  Misses         25       25           

Flag	Coverage Δ
unittests	90.34% <100.00%> (ø)

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