What is the `contains` rule?

Ok, this is the final day of our week-long focus on validation. I hope you enjoyed it, and checked out the updated validation book for yourself.

In today's video, I'll explain how the new contains rule works, and connect it to a rule you're already familiar with to make it easier to understand.

Watch Now (3 min)

And after watching, don't forget to subscribe to our YouTube channel, so you don't miss future videos.

Here to help,

Joel

P.S. And here's a link to the validation book I mentioned in the video.