AWS Event bridge rule pattern to capture event without wildcards use

Question

I need help in creating a event bridge rule pattern to capture an AWS event given below, with few variables mentioned under angle brackets <>, requirement is to capture events where resources object ARN have suffix of sample AND prefix of product. The solution should not be using wildcards:

Event:

 {
      "requestParameters": {
        "bucketName": "mybucket",
        "key": "product/<2023-11-11>/<10-31-04>/<my->sample.json",
      },
      "resources": [
        {
          "type": "AWS::S3::Object",
          "ARN": "arn:aws:s3:::mybucket/product/<2023-11-11>/<10-31-04>/<my->sample.json"
        },
        {
          "accountId": "1234567890",
          "type": "AWS::S3::Bucket",
          "ARN": "arn:aws:s3:::mybucket"
        }
      ]
}

Answer 1

You can use a pattern like this:

{
  "resources": {
    "ARN": [{
      "wildcard": "arn:aws:s3:::*/product/*/*/*sample.*"
    }]
  }
}

In resources array, it will match any ARN that has the matching wildcard. The wildcard expects ARN to:

1. start with arn:aws:s3:::
2. can be any bucket
3. the starting folder should be product
4. It should have 2 folder
5. the file name should end with sample

Sample event of EventBridge

{
  "id": "234234",
  "account": "23423423",
  "source": "asdfsf",
  "time": "2016-01-10T01:29:23Z",
  "region": "ap-south-1",
  "detail-type": "234234",
  "requestParameters": {
    "bucketName": "mybucket",
    "key": "product/2023-11-11/10-31-04/my-sample.json"
  },
  "resources": [{
      "type": "AWS::S3::Object",
      "ARN": "arn:aws:s3:::mybucket/product/2023-11-11/10-31-04/my-sample.json"
    },
    {
      "accountId": "1234567890",
      "type": "AWS::S3::Bucket",
      "ARN": "arn:aws:s3:::mybucket"
    }
  ]
}

References:

https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns-arrays.html

Amazon EventBridge: Match an object inside of an array