refactor(cli): make regexps constants

[timreichen]

• moves regexps outside function and makes them constants.
• adds named capturing group to VALUE_REGEXP instead of testing and splitting value afterwards.
• reduces code block with the same regexp check.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.36%. Comparing base (b213d54) to head (a94bc87).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5595   +/-   ##
=======================================
  Coverage   96.36%   96.36%           
=======================================
  Files         465      465           
  Lines       37506    37513    +7     
  Branches     5527     5528    +1     
=======================================
+ Hits        36144    36151    +7     
  Misses       1320     1320           
  Partials       42       42           

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[iuioiua]

LGTM