JSON Parser Bug Fix

[Adityakk9031]

What kind of change does this PR introduce?

Bug fix – corrects string detection in the custom JSON parser to properly handle escaped backslashes and quotes.

Issue Number

Closes #2237

Screenshots / Videos

N/A – this is a logic fix in the parser. Automated tests have been added to verify the behavior.

Summary

This PR fixes a bug in the custom JSON parser (lib/getPartsOfJson.ts) where strings ending with an escaped backslash (for example, "value \\\\") were incorrectly treated as unterminated. This caused syntax highlighting and parsing issues for the remainder of the JSON block. The fix updates the string‑matching and quote‑detection logic so that escaped characters are handled correctly and valid JSON strings are no longer misclassified.

Changes

• Updated regexString to correctly match strings containing escaped characters as produced by JSON.stringify.
• Updated regexDoubleQuote to use a parity‑aware lookbehind so that only truly unescaped quotes are treated as string terminators.
• Ensured that non‑capturing groups are used in the lookbehind to remain compatible with the getFindResultsByGlobalRegExp helper.

Does this PR introduce a breaking change?

No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

[github-actions]

Hi @Adityakk9031! Thanks a lot for your contribution!

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Thanks a lot!

[github-actions]

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[Adityakk9031]

@Utkarsh-123github sir please check this pr

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1e8d74b) to head (a69042b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage   100.00%   100.00%           
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  Files           30        30           
  Lines          663       663           
  Branches       205       205           
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  Hits           663       663           

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[Adityakk9031]

@jagpreetrahi sir have a look