When creating a plan branch, is there a way to configure it to make new branch when a pull request is created and in addition, on a set of branches that match a custom regex?
I fear there's no such Bamboo feature - yet. The feature existing is "When new branch in repository is created and matches expression". You'd like to have the same but for PR.
I found this still unresolved bug for you: https://jira.atlassian.com/browse/BAM-19825?_ga=2.53926881.851830885.1537792570-1311615398.1523044491
Please register yourself as a watcher for it, vote on it or comment and stress this feature's urgency for you. It gets directly read by our Devs!
Thanks and cheers