Fixes global regex value

[coordt]

Fixes #64

Changed default regex CLI value to None.

The default value of False was overriding other values.

[github-actions]

Version hint: minor
Current version: 0.14.0
New version (when merged): 0.15.0

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

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (909396d) 93.24% compared to head (93191f3) 92.96%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
bumpversion/files.py	33.33%	1 Missing and 1 partial ⚠️
bumpversion/version_part.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
- Coverage   93.24%   92.96%   -0.29%     
==========================================
  Files          19       19              
  Lines        1243     1250       +7     
  Branches      256      257       +1     
==========================================
+ Hits         1159     1162       +3     
- Misses         56       59       +3     
- Partials       28       29       +1     

Flag	Coverage Δ
python-3.10	92.96% <50.00%> (-0.29%)	⬇️
python-3.11	92.96% <50.00%> (-0.29%)	⬇️
python-3.8	92.96% <50.00%> (-0.29%)	⬇️
python-3.9	92.96% <50.00%> (-0.29%)	⬇️

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