diff --git a/actionpack/lib/action_dispatch/journey/nodes/node.rb b/actionpack/lib/action_dispatch/journey/nodes/node.rb
index ea0a6835e9..04503e4010 100644
--- a/actionpack/lib/action_dispatch/journey/nodes/node.rb
+++ b/actionpack/lib/action_dispatch/journey/nodes/node.rb
@@ -86,10 +86,6 @@ module ActionDispatch
           @name = -left.tr("*:", "")
         end
 
-        def default_regexp?
-          regexp == DEFAULT_EXP
-        end
-
         def type; :SYMBOL; end
         def symbol?; true; end
       end
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 92bcd1fb2d..bbbc386ef5 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -136,8 +136,6 @@ module ActionDispatch
               # Add a constraint for wildcard route to make it non-greedy and match the
               # optional format part of the route by default.
               wildcard_options[node.name.to_sym] ||= /.+?/
-            elsif node.cat?
-              alter_regex_for_custom_routes(node)
             end
           end
 
@@ -211,24 +209,6 @@ module ActionDispatch
         private :request_method
 
         private
-          # Find all the symbol nodes that are adjacent to literal nodes and alter
-          # the regexp so that Journey will partition them into custom routes.
-          def alter_regex_for_custom_routes(node)
-            if node.left.literal? && node.right.symbol?
-              symbol = node.right
-            elsif node.left.literal? && node.right.cat? && node.right.left.symbol?
-              symbol = node.right.left
-            elsif node.left.symbol? && node.right.literal?
-              symbol = node.left
-            elsif node.left.symbol? && node.right.cat? && node.right.left.literal?
-              symbol = node.left
-            end
-
-            if symbol
-              symbol.regexp = /(?:#{Regexp.union(symbol.regexp, '-')})+/
-            end
-          end
-
           def intern(object)
             object.is_a?(String) ? -object : object
           end
diff --git a/actionpack/test/journey/nodes/symbol_test.rb b/actionpack/test/journey/nodes/symbol_test.rb
index b0622ac71a..e69de29bb2 100644
--- a/actionpack/test/journey/nodes/symbol_test.rb
+++ b/actionpack/test/journey/nodes/symbol_test.rb
@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-require "abstract_unit"
-
-module ActionDispatch
-  module Journey
-    module Nodes
-      class TestSymbol < ActiveSupport::TestCase
-        def test_default_regexp?
-          sym = Symbol.new "foo"
-          assert_predicate sym, :default_regexp?
-
-          sym.regexp = nil
-          assert_not_predicate sym, :default_regexp?
-        end
-      end
-    end
-  end
-end