Improve Regex syntax highlighting (#25332)

Release Notes:

  - Improved Regex syntax highlighting

| Zed 0.174.6 | With this PR |
| --- | --- |
|
![Image](https://github.com/user-attachments/assets/2a0bb1d9-cbba-490c-b2be-08c94bc79517)
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![Image](https://github.com/user-attachments/assets/b19f3871-ee83-4165-a026-207bdbbcad44)
|

- `(?P=`, `<`: `punctuation.bracket`
- `group_name`: `property` -> `label`
- `^`, `$`: `string.escape` -> `operator`
- `\b`, `\B`, `\k`: `string.escape` -> `keyword.operator`
- added `regex` scope to target regex tokens specifically

```js
regex = /^(?<group>[!\.\?])\b[a-z]+word\k<group>$/g
```

---------

Co-authored-by: João Marcos <marcospb19@hotmail.com>
f4d1e7901cchbk committed on 3/22/2025, 7:11:19 PM· committed by GitHubparent044eb7b
1 file changedLine totals unavailable