build_path

# File actionpack/lib/action_dispatch/routing/route_set.rb, line 373
      def build_path(path, requirements, separators, anchor)
        strexp = Journey::Router::Strexp.new(
            path,
            requirements,
            SEPARATORS,
            anchor)

        pattern = Journey::Path::Pattern.new(strexp)

        builder = Journey::GTG::Builder.new pattern.spec

        # Get all the symbol nodes followed by literals that are not the
        # dummy node.
        symbols = pattern.spec.grep(Journey::Nodes::Symbol).find_all { |n|
          builder.followpos(n).first.literal?
        }

        # Get all the symbol nodes preceded by literals.
        symbols.concat pattern.spec.find_all(&:literal?).map { |n|
          builder.followpos(n).first
        }.find_all(&:symbol?)

        symbols.each { |x|
          x.regexp = /(?:#{Regexp.union(x.regexp, '-')})+/
        }

        pattern
      end