# Preflight Check: RegExp Match (/docs/dsr-automation/preflight-and-enrichment/preflight-checks/preflight-check-regexp-match)

Similarly to the [Region Matcher](./preflight-check-region-matcher.mdx), RegExp Match will run the provided `Regular Expression` on the `Input Identifier`, and change the status of the request when a match is found.

The screenshot below illustrates a preflight check set up to automatically reject requests for which the input identifier (email) ends with "@acme.com".

![Region Rejection Preflight Check](/images/screenshot/2025-04-23-dsr-automation-preflight-check-regex-check.png)