feat(regexp): stricter regexps

[avivkeller]

Fixes: #378
Companion: nodejs/node#60087

Makes the RegExp's more strict by removing all optional pieces.

[vercel]

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Project	Deployment	Preview	Updated (UTC)
api-docs-tooling	Ready	Preview	Oct 1, 2025 4:41pm

[Copilot]

Pull Request Overview

This PR makes regular expressions stricter by removing optional backticks and text patterns, addressing issue #378 and complementing a Node.js PR. The changes ensure that API documentation headings must include specific formatting requirements that were previously optional.

Key changes:

• Removes optional backticks from all regex patterns to require strict backtick formatting
• Simplifies event regex to require single quotes only
• Removes optional "Constructor:" and "Class property:" prefixes from their respective patterns

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.55%. Comparing base (a4149a4) to head (497099d).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #449 +/- ##
==========================================
- Coverage 74.56% 74.55% -0.02% 
==========================================
Files 107 107 Lines 10459 10453 -6 Branches 681 681 ==========================================
- Hits 7799 7793 -6 
Misses 2658 2658 Partials 2 2 

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