✨ Support generation of strings not constrained by ^ or $

[dubzzz]

Up-to-now generating strings out of regexes not defining ^ and $ was equivalent to having them. It now differs!

Category:

• ✨ Introduce new features
• 📝 Add or update documentation
• ✅ Add or update tests
• 🐛 Fix a bug
• 🏷️ Add or update types
• ⚡️ Improve performance
• Other(s): ...

Potential impacts:

• Generated values
• Shrink values
• Performance
• Typings
• Other(s): ...

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[codecov]

Codecov Report

Merging #3935 (8f1a97e) into main (4da73fd) will decrease coverage by 0.10%.
The diff coverage is 88.11%.

@@            Coverage Diff             @@
##             main    #3935      +/-   ##
==========================================
- Coverage   94.75%   94.66%   -0.10%     
==========================================
  Files         208      209       +1     
  Lines        5736     5825      +89     
  Branches     1296     1333      +37     
==========================================
+ Hits         5435     5514      +79     
- Misses        284      294      +10     
  Partials       17       17              

Flag	Coverage Δ
unit-tests	94.66% <88.11%> (-0.10%)	⬇️
unit-tests-14.x-Linux	94.66% <88.11%> (-0.10%)	⬇️
unit-tests-16.x-Linux	94.66% <88.11%> (-0.10%)	⬇️
unit-tests-18.x-Linux	94.66% <88.11%> (-0.10%)	⬇️
unit-tests-latest-Linux	94.66% <88.11%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...c/arbitrary/_internals/helpers/SanitizeRegexAst.ts	80.95% <80.95%> (ø)
...heck/src/arbitrary/_internals/helpers/ReadRegex.ts	91.60% <100.00%> (+1.13%)	⬆️
.../src/arbitrary/_internals/helpers/TokenizeRegex.ts	94.38% <100.00%> (+0.23%)	⬆️
...ackages/fast-check/src/arbitrary/stringMatching.ts	82.65% <100.00%> (+2.24%)	⬆️