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This PR fixes an issue where if you use a number with a decimal in a
variant then it wasn't picked up correctly.
E.g.:
```
<div class="2xl:flex 1.5xl:flex"></div>
^^^^^^^^ Picked up
^^^^^^^^^^ Not picket up
```
This PR fixes that behavior by applying the same rules for utilities
where a `.` is valid if it is surrounded by numbers.
# Test plan
1. Added test to ensure this is picked up
2. Existing tests pass
3. Ran the extractor on a real example with the following results:
| Before | After |
| --- | --- |
| <img width="821" alt="image"
src="https://github.com/user-attachments/assets/a77ed5e4-6848-4fe3-8cbf-cf61ff8db41d"
/> | <img width="821" alt="image"
src="https://github.com/user-attachments/assets/61aca66a-e38d-4b61-bf86-e6286a89a3d9"
/> |
They are crossed out just because it's not a default value we know in
the system, but you can see that the `1.` part is also extracted now.
Fixes: #17148