I came across this multi-list field restrictions to limit range(selection) using regex. I got few references to add basic validations. Both work fine.
I'm looking to add regex which makes the user to select even no. items only.
Did anyone come across regex to handle custom validation at field level like this? I have added a custom field level validation rule in normal, but looking if there is any regex to handle this scenario. (Sitecore 8.2u3)