Negation in Branch permission patterns

User Problem

1. Based on Branch permission patterns, it's not possible to match negative patterns for the branch name.
2. For example, to allow users from a user group named Group A to be able to ONLY push to branch name group/a/**.

Suggested Solutions

1. To have the ability to match negative patterns for the branch name.

Current Workarounds

It's possible to use Scriptrunner for Bitbucket - Custom Pre-Receive Hooks to block changes from being pushed by checking the branch name and user triggered the hook.
Please take note that this is provided by a third-party app; Scriptrunner for Bitbucket.