Monitoring URL that match the string


Currently, I am using the Blackbox-Exporter tool to monitor URLs. I have a new requirement now and according to that requirement I have to monitor the URL and the URL must check for the string. I mean the URL should contain the string “this is a test”. Not sure is this possible or not using BlackBox-Exporter.

For example, I want to monitor an URL: and this URL should match the string “this is a test
I have seen this functionality in URL monitoring Paid tools like Pingdom.

A quick response will be appreciated.