Add regex example to advanced routing

[ciarams87]

Proposed changes

Problem: The advanced routing guide in the documentation is being updated to include an example for regex path type so we need to update our examples to reflect this

Solution: Add the new regex route yaml corresponding to the guide

Closes #3946

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.51%. Comparing base (1c3bf8e) to head (94773df).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4073      +/-   ##
==========================================
- Coverage   86.53%   86.51%   -0.02%     
==========================================
  Files         131      131              
  Lines       17796    17796              
  Branches       74       74              
==========================================
- Hits        15399    15397       -2     
- Misses       2197     2199       +2     
  Partials      200      200              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[shaun-nx]

@ciarams87 would it be better to add this new HTTPRoute to cafe-routes.yaml as that already has two HTTPRoutes in there for different routing scenarios?