JsonPartialMatcher - support Regex

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #771 (7e6340c) into master (150b448) will decrease coverage by 0.07%.
The diff coverage is 79.88%.

@@            Coverage Diff             @@
##           master     #771      +/-   ##
==========================================
- Coverage   72.07%   72.00%   -0.08%     
==========================================
  Files         209      209              
  Lines        7206     7243      +37     
  Branches      745      750       +5     
==========================================
+ Hits         5194     5215      +21     
- Misses       1787     1800      +13     
- Partials      225      228       +3     

Impacted Files	Coverage Δ
...rc/WireMock.Net/Settings/WireMockServerSettings.cs	97.22% <ø> (ø)
src/WireMock.Net/Util/RegexUtils.cs	24.13% <24.00%> (+24.13%)	⬆️
src/WireMock.Net/Serialization/MatcherMapper.cs	85.15% <37.50%> (-2.55%)	⬇️
...ireMock.Net/Matchers/AbstractJsonPartialMatcher.cs	72.50% <83.33%> (+4.64%)	⬆️
src/WireMock.Net/RequestMessage.cs	90.16% <91.52%> (ø)
...c/WireMock.Net/RegularExpressions/RegexExtended.cs	94.23% <92.50%> (ø)
...ck.Net.Abstractions/Admin/Mappings/MatcherModel.cs	100.00% <100.00%> (ø)
src/WireMock.Net/Matchers/JsonMatcher.cs	93.15% <100.00%> (ø)
src/WireMock.Net/Matchers/JsonPartialMatcher.cs	100.00% <100.00%> (ø)
...ireMock.Net/Matchers/JsonPartialWildCardMatcher.cs	100.00% <100.00%> (ø)
... and 7 more

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