ci: update vcpkg url regex

[scotthart]

Escape the . characters in the date format.

This change is 

[gemini-code-assist]

Summary of Changes

Hello @scotthart, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical issue in the CI script responsible for downloading vcpkg. By accurately escaping dots in the regular expression, it ensures that date-like vcpkg version tags are correctly parsed, thereby preventing potential build failures related to incorrect vcpkg archive URL generation.

Highlights

• Vcpkg URL Regex Fix: Corrected the regular expression used to identify date-like vcpkg version tags in the CI script. The previous regex incorrectly treated dots as wildcards, which could lead to misidentification of version strings and incorrect URL construction.

Changelog

• ci/kokoro/lib/vcpkg.sh
  • Fixed regex for vcpkg version matching to correctly interpret literal dots.

Activity

• No specific activity has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

The pull request correctly updates the regular expression used to identify date-like vcpkg versions. By escaping the literal dots in the regex, it ensures that the pattern accurately matches YYYY.MM.DD formats, preventing potential mismatches and ensuring the correct archive URL is constructed.

[gemini-code-assist]

The change to escape the dots (.) in the regular expression is a crucial correctness fix. In regex, an unescaped dot acts as a wildcard matching any character, which could lead to unintended matches for VCPKG_VERSION strings that are not in the YYYY.MM.DD format. Escaping them with \. ensures that only literal dots are matched, making the version detection robust and accurate for constructing the correct download URL.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.63%. Comparing base (fea1ad9) to head (e114c6f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15998   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files        2334     2334           
  Lines      214635   214635           
=======================================
+ Hits       198831   198833    +2     
+ Misses      15804    15802    -2     

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