In order to be able to create a custom validator you need to have some programming knowledge. Complexity depends of what you want to achieve. It could be a very simple script or very hard. Below are few examples:
All information who to deplo such a custom script you can find in the documentation:
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot