fix: Multi-selector regex expansion

[orlp]

Fixes #22536.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.07%. Comparing base (810df45) to head (0df8819).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22542      +/-   ##
==========================================
- Coverage   81.08%   81.07%   -0.01%     
==========================================
  Files        1651     1651              
  Lines      232587   232587              
  Branches     2746     2746              
==========================================
- Hits       188587   188567      -20     
- Misses      43345    43365      +20     
  Partials      655      655              

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