Scheduled check of application logs for patterns in AWS

Question

I have a web application that produces a large amount of log data. We use Cloudwatch to trigger alerts when certain exceptions are detected. Those alerts go to an SNS topic and are sent out as emails. Instead of sending one email for each exception log, I would like run a check every hour for the exceptions and send a single email with all the logs. Can this be accomplished with Cloudwatch or have to use a different service.