User-journey tests are designed to simulate a typical user's "journey" through the system. Such a test will typically cover a user's entire interaction the system in order to achieve some goal.
Regression testing is a software testing practice that ensures an application still functions as expected after any code changes, updates, or improvements.
https://katalon.com/resources-center/blog/regression-testing
Basically, there is no extra effort required to write regression test, we can reuse the User Journey defined in our performance test.
References
https://martinfowler.com/bliki/UserJourneyTest.html
https://katalon.com/resources-center/blog/regression-testing