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Please provide as much information as possible. At least, this should include a description of your issue and steps to reproduce the problem. If possible please provide a summary of what steps or workarounds you have already tried, and any docs or articles you found (un)helpful.

Problem you have encountered:
For Cloud Build webhook based event, with source repository as Gen 2, as per docs it says that regex condition can be applied for branch name. Whereas from console it shows regex is not supported.

What you expected to happen:
I'm expecting to have regex condition on the branch name to pull the respective branch based on webhook event.

Steps to reproduce:
Try creating a repository in Cloud Build with Gen 2 and apply webhook based event for the same repo.

Other information (workarounds you have tried, documentation consulted, etc):