docs/input.md in fluent-plugin-s3-1.7.0 vs docs/input.md in fluent-plugin-s3-1.7.1

@@ -16,18 +16,23 @@
       aws_key_id YOUR_AWS_KEY_ID
       aws_sec_key YOUR_AWS_SECRET_KEY
       s3_bucket YOUR_S3_BUCKET_NAME
       s3_region ap-northeast-1
       add_object_metadata true
+      match_regexp production_.*
 
       <sqs>
         queue_name YOUR_SQS_QUEUE_NAME
       </sqs>
     </source>
 
 ## add_object_metadata
 
 Whether or not object metadata should be added to the record. Defaults to `false`. See below for details.
+
+## match_regexp
+
+If provided, process the S3 object only if its keys matches the regular expression
 
 ## s3_bucket (required)
 
 S3 bucket name.