Add String functions for regex and distance

[Akanksha-kedia]

Instructions:

1. The PR has to be tagged with at least one of the following labels (*):
   1. feature
   2. bugfix
   3. performance
   4. ui
   5. backward-incompat
   6. release-notes (**)
2. Remove these instructions before publishing the PR.

(*) Other labels to consider:

• testing
• dependencies
• docker
• kubernetes
• observability
• security
• code-style
• extension-point
• refactor
• cleanup

(**) Use release-notes label for scenarios like:

• New configuration options
• Deprecation of configurations
• Signature changes to public methods/interfaces
• New plugins added or old plugins removed

[Akanksha-kedia]

@Jackie-Jiang please review

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 63.23%. Comparing base (3be9fbe) to head (890123f).

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17372      +/-   ##
============================================
- Coverage     63.28%   63.23%   -0.06%     
  Complexity     1474     1474              
============================================
  Files          3147     3147              
  Lines        187576   187593      +17     
  Branches      28712    28719       +7     
============================================
- Hits         118712   118619      -93     
- Misses        59663    59780     +117     
+ Partials       9201     9194       -7     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.19% <100.00%> (-0.02%)	:arrow_down:
java-21	63.20% <100.00%> (-0.03%)	:arrow_down:
temurin	63.23% <100.00%> (-0.06%)	:arrow_down:
unittests	63.22% <100.00%> (-0.06%)	:arrow_down:
unittests1	55.64% <100.00%> (-0.02%)	:arrow_down:
unittests2	33.88% <0.00%> (-0.05%)	:arrow_down:

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[Akanksha-kedia]

@Jackie-Jiang please review again Thanks!!1