fix: handle single-character fromRegExp patterns

[hiSandog]

Summary

• generate a value for a single wildcard pattern instead of returning a literal dot
• support case-insensitive single-letter RegExp inputs like /w/i
• enable the existing TODO tests for those cases

Validation

• pnpm exec vitest run test/modules/helpers.spec.ts
• pnpm exec eslint src/modules/helpers/index.ts test/modules/helpers.spec.ts

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[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.84%. Comparing base (5bd8709) to head (e02ff21).
⚠️ Report is 1 commits behind head on next.

Files with missing lines	Patch %	Lines
src/modules/helpers/index.ts	91.17%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3877      +/-   ##
==========================================
- Coverage   98.92%   98.84%   -0.09%     
==========================================
  Files         908      908              
  Lines        3159     3193      +34     
  Branches      581      591      +10     
==========================================
+ Hits         3125     3156      +31     
- Misses         30       33       +3     
  Partials        4        4              

Files with missing lines	Coverage Δ
src/modules/helpers/index.ts	94.84% <91.17%> (-0.43%)	⬇️

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[ST-DDT]

This will cause a merge conflict with #3857

• feat: transform core modules to standalone module functions #3857

So this may take far longer than usual to merge.

[ST-DDT]

This PR only makes the existing rudementary tests green, it does not really implement the feature.

faker.helpers.fromRegExp(/./) // "8"
faker.helpers.fromRegExp(/../) // ".." ❌
faker.helpers.fromRegExp(/w/i) // "W"
faker.helpers.fromRegExp(/ww/i) // "ww" ❌

🏴 BAD-QUALITY: Please ensure PRs are reviewed for quality by humans before submission.

[hiSandog]

Fixed in d0f1503. The implementation now scans remaining unquantified regex tokens after stripping anchors, replacing repeated wildcard dots like /../ with generated characters and applying case-insensitive generation to repeated literal letters like /ww/i. Added focused regression coverage for both cases and reran helpers.spec.ts.

Fixed

[ST-DDT]

There is one issue with the current implementation of the fromRegExp method.
It basically repeats parts of the implementation over and over.
First for unquantified, then for quantified, then for ranges, ...

It fixes the todo, so I think it is an improvement, but it might be worth refactoring/re-implementing it eventually.