Concatenate form value with custom value in record rules

In the record rules, it would be great to be able to concatenate a custom value with a form value. For example insert a web link to a field where the front part of the url would always be the same, but some parameters can be taken from the submitted form dynamical. Like links to youtube videos, or links to an external service that uses some field value as an identifier in the url. I can think of a lot of use cases for such a feature.

Yes! I was only looking at the record rules and did not see that feature while it does exactly what I want. This post can be closed. Thank you for your quick help!

Thank you for the quick answer, this could indeed do the job (although not in record rules). I will have a look. The link doesn't work though :)