1---
 2title: Rego
 3description: "Configure Rego language support in Zed, including language servers, formatting, and debugging."
 4---
 5
 6# Rego
 7
 8Rego language support in Zed is provided by the community-maintained [Rego extension](https://github.com/StyraInc/zed-rego).
 9
10- Tree-sitter: [FallenAngel97/tree-sitter-rego](https://github.com/FallenAngel97/tree-sitter-rego)
11- Language Server: [open-policy-agent/regal](https://github.com/open-policy-agent/regal)
12
13## Installation
14
15The extension is largely based on the [Regal](https://docs.styra.com/regal/language-server) language server which should be installed to make use of the extension. Read the [getting started](https://docs.styra.com/regal#getting-started) instructions for more information.
16
17## Configuration
18
19The extension's behavior is configured in the `.regal/config.yaml` file. The following is an example configuration which disables the `todo-comment` rule, customizes the `line-length` rule, and ignores test files for the `opa-fmt` rule:
20
21```yaml
22rules:
23  style:
24    todo-comment:
25      # don't report on todo comments
26      level: ignore
27    line-length:
28      # custom rule configuration
29      max-line-length: 100
30      # warn on too long lines, but don't fail
31      level: warning
32    opa-fmt:
33      # not needed as error is the default, but
34      # being explicit won't hurt
35      level: error
36      # files can be ignored for any individual rule
37      # in this example, test files are ignored
38      ignore:
39        files:
40          - "*_test.rego"
41```
42
43Read Regal's [configuration documentation](https://docs.styra.com/regal#configuration) for more information.