# File lib/repo.rb, line 233
        def findStableBase(branch)
            base=nil
            if branch =~ @branch_format then
                base = branch.gsub(/^\*?\s*#{@branch_format_raw}\/.*$/, @stable_base_format)
            end

            @stable_base_patterns.each(){|pattern, b|
                if branch =~ /#{pattern}\// || branch =~ /#{pattern}$/
                    base = b
                    break
                end
            }
            raise("Could not a find a stable base for branch #{branch}") if base == nil
            return base
        end