jenkins_list_git_tags_and_branches.groovy

def gettags = ("git ls-remote -t -h ssh://jenkins@<mygitpath>/repo/some.git feature/*").execute()

return gettags.text.readLines()
         .collect { it.split()[1].replaceAll('refs/heads/', '')  }
         .unique()
         .findAll { it.startsWith('<some more pattern>') }