Unique Match Count for Email Addresses

Hello,

With 11.6.x DLP has capability to do unique match count on policies which uses Data identifiers and is working fairly well. We have a different policy which is based on REGEX to detect email addresses being sent out via attachments. Our current policy is designed to detect more than 100 email ids, but unfortunately it detects even if the email id is only one and is repeated 100 times. There is no unique match count option available.

Has anyone experienced this or found a solution?

thanks in advance..