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737994b7aa
This PR fixes a bug where a class like `header_1` wasn't properly extracted because we didn't allow an `_` before a number. This PR fixes that by allowing an `_` before a number. Fixes: #17960 ## Test plan 1. Added a test to verify this works 2. Existing tests work Used the visualizer tool for this to verify that the `header_1` class is being extracted: <img width="1816" alt="image" src="https://github.com/user-attachments/assets/fdc21602-0e2b-4e4e-92a1-19c4f4f5393f" />
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