# Filter GitHub webhook events (CloudFormation)
<a name="github-webhook-events-cfn"></a>

 To use an CloudFormation template to filter webhook events, use the AWS CodeBuild project's `FilterGroups` property.

For more information about GitHub webhook events, see [GitHub webhook events](github-webhook.md).

The following YAML-formatted portion of an CloudFormation template creates two filter groups. Together, they trigger a build when one or both evaluate to true: 
+  The first filter group specifies pull requests are created or updated on branches with Git reference names that match the regular expression `^refs/heads/main$` by a GitHub user who does not have account ID `12345`. 
+  The second filter group specifies push requests are created on files with names that match the regular expression `READ_ME` in branches with Git reference names that match the regular expression `^refs/heads/.*`. 
+ The third filter group specifies a push request with a head commit message matching the regular expression `\[CodeBuild\]`.
+ The fourth filter group specifies a GitHub Actions workflow job request with a workflow name matching the regular expression `\[CI-CodeBuild\]`.

```
CodeBuildProject:
  Type: AWS::CodeBuild::Project
  Properties:
    Name: MyProject
    ServiceRole: service-role
    Artifacts:
      Type: NO_ARTIFACTS
    Environment:
      Type: LINUX_CONTAINER
      ComputeType: BUILD_GENERAL1_SMALL
      Image: aws/codebuild/standard:5.0
    Source:
      Type: GITHUB
      Location: source-location
    Triggers:
      Webhook: true
      FilterGroups:
        - - Type: EVENT
            Pattern: PULL_REQUEST_CREATED,PULL_REQUEST_UPDATED
          - Type: BASE_REF
            Pattern: ^refs/heads/main$
            ExcludeMatchedPattern: false
          - Type: ACTOR_ACCOUNT_ID
            Pattern: 12345
            ExcludeMatchedPattern: true
        - - Type: EVENT
            Pattern: PUSH
          - Type: HEAD_REF
            Pattern: ^refs/heads/.*
          - Type: FILE_PATH
            Pattern: READ_ME
            ExcludeMatchedPattern: true
        - - Type: EVENT
            Pattern: PUSH
          - Type: COMMIT_MESSAGE
            Pattern: \[CodeBuild\]
          - Type: FILE_PATH
            Pattern: ^src/.+|^test/.+
        - - Type: EVENT
            Pattern: WORKFLOW_JOB_QUEUED
          - Type: WORKFLOW_NAME
            Pattern: \[CI-CodeBuild\]
```