I want to be able to validate a JIRA field content. For example, only if the entered value matches some other value, then JIRA allows to update that field. Besides Behaviour plugin, is there other way/plugin that does this task? Thanks.
The standard way to do that is use validators in the workflow - they can check the content of fields and prevent issues moving on if things are incorrect. There's not many distributed with off-the-shelf JIRA, but loads of them in add-ons, and you can write your own with Script Runner
Yes, validators kick in after the user clicks the button to go on through the transition, and return the user to the screen with an error message on why it's failed validation. That is "accept/deny at update time".
I'm not aware of any add-ons that would allow you to define your own rules other than Behaviours in Script Runner. There are some which will do a lot of validations, but they're mostly for fixed cases (like date A after date B)
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