Add regexMatch operator, clean up extra blank lines

[robertpba]

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Add the operator "regexMatch" which tests a string using a regular expression. Example use: { "field": "id", "operator": "regexMatch", "value": "^(?![0-9A-Za-z]{4}$).+" } This checks if the id is exactly 4 characters long, consisting only of characters 0..9, A..Z, a..z. If the string does not match this pattern, the operator evaluates to true.

Also removed many extra blank lines (i.e. one out of 2 consecutive blank lines).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 69.48%. Comparing base (05252cd) to head (d2baee9).

Files with missing lines	Patch %	Lines
JsonRuleEngine.Net/Engine/JsonRuleEngine.cs	12.50%	14 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   70.48%   69.48%   -1.01%     
==========================================
  Files          10       10              
  Lines        1064     1078      +14     
  Branches      163      164       +1     
==========================================
- Hits          750      749       -1     
- Misses        275      289      +14     
- Partials       39       40       +1     

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