Fix matching of $ when there are trailing newlines

[justin-tay]

Closes #495

This updates the Joni and JDK RegularExpression to treat the $ anchor in the same way as ECMAScript.

This needed to update the pattern itself, namely replacing the $ anchor for \z The underlying issue being that the semantic meaning of $ for Joni and JDK is different from ECMAScript in that it allows trailing newlines. The meaning of \z is closer to what $ means for ECMAScript.

It's not possible for Joni to support this without changes to their code, this is actually determined in their Lexer. What is needed is AnchorType.END_BUF but for $ whether it's singleline or multiline only toggles between AnchorType.SEMI_END_BUF and AnchorType.END_LINE.

• https://github.com/jruby/joni/blob/65b181b42b8d3737ecf55be0d84f3bf46e76b129/src/org/joni/Lexer.java#L1117-L1119

               case 'z':
                    if (syntax.opEscAZBufAnchor()) fetchTokenFor_anchor(AnchorType.END_BUF);
                    break;

• https://github.com/jruby/joni/blob/65b181b42b8d3737ecf55be0d84f3bf46e76b129/src/org/joni/Lexer.java#L1244-L1246

                case '$':
                    if (syntax.opLineAnchor()) fetchTokenFor_anchor(isSingleline(env.option) ? AnchorType.SEMI_END_BUF : AnchorType.END_LINE);
                    break;

This also updates JDK RegularExpression to be able to accept the long form Unicode Character properties that ECMAScript also accepts.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 81.48148% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.97%. Comparing base (48ca3c2) to head (357b27e).
⚠️ Report is 106 commits behind head on master.

Files with missing lines	Patch %	Lines
...com/networknt/schema/regex/RegularExpressions.java	81.06%	15 Missing and 10 partials ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1201      +/-   ##
============================================
- Coverage     78.90%   77.97%   -0.93%     
+ Complexity     1965     1923      -42     
============================================
  Files           172      200      +28     
  Lines          6352     6730     +378     
  Branches       1255     1188      -67     
============================================
+ Hits           5012     5248     +236     
- Misses          867     1040     +173     
+ Partials        473      442      -31     

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