Topic/look around

[SimY4]

First implementation for positive/negative look-ahead/look-behind patterns is finally at review stage.

Fixes #34

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 63.56589% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.68%. Comparing base (319d406) to head (a8c46f7).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...a/com/github/simy4/coregex/core/CoregexParser.java	28.57%	25 Missing ⚠️
...in/java/com/github/simy4/coregex/core/Coregex.java	75.28%	18 Missing and 4 partials ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #175      +/-   ##
============================================
+ Coverage     65.45%   68.68%   +3.23%     
- Complexity      142      154      +12     
============================================
  Files            14       15       +1     
  Lines           851      958     +107     
  Branches        118      138      +20     
============================================
+ Hits            557      658     +101     
- Misses          250      252       +2     
- Partials         44       48       +4     

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[Copilot]

Pull Request Overview

This PR implements support for positive and negative look-ahead and look-behind patterns in the regex engine, addressing issue #34. The implementation introduces a rewind mechanism to handle cases where lookaround patterns fail to match.

• Adds lookaround pattern support with positive/negative look-ahead/look-behind functionality
• Introduces a rewind mechanism using RewindException for pattern matching failures
• Refactors the API to use string-based matching instead of character-based operations

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
CoregexInstances.scala	Refactors shrink implementation using LazyList.unfold for better functional style
SetSuite.scala	Updates tests to use new string-based matching API and adds Locale import
CoregexSuite.scala	Adds new test cases for literal and group matching functionality
CoregexParserSuite.scala	Updates test expectations from UnsupportedOperationException to IllegalStateException
CoregexArbitraries.scala	Adds shrink instances for Coregex types and imports option converters
Set.java	Removes IntPredicate interface and implements string-based matching
RewindException.java	New exception class for handling pattern rewind scenarios
CoregexParser.java	Implements parsing logic for lookaround patterns
Coregex.java	Major refactoring to support lookaround patterns and string-based matching

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