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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