Added custom regexps to ASTs that have literal nodes on either side of

symbol nodes.  Fixes #4585

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -360,7 +360,26 @@ def build_path(path, requirements, separators, anchor)
             SEPARATORS,
             anchor)
 
-        Journey::Path::Pattern.new(strexp)
+        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
       private :build_path
 

actionpack/test/controller/routing_test.rb

@@ -83,6 +83,68 @@ def setup
     @response = nil
   end
 
+  def test_symbols_with_dashes
+    rs.draw do
+      match '/:artist/:song-omg', :to => lambda { |env|
+        resp = JSON.dump env[ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+        [200, {}, [resp]]
+      }
+    end
+
+    hash = JSON.load get(URI('http://example.org/journey/faithfully-omg'))
+    assert_equal({"artist"=>"journey", "song"=>"faithfully"}, hash)
+  end
+
+  def test_id_with_dash
+    rs.draw do
+      match '/journey/:id', :to => lambda { |env|
+        resp = JSON.dump env[ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+        [200, {}, [resp]]
+      }
+    end
+
+    hash = JSON.load get(URI('http://example.org/journey/faithfully-omg'))
+    assert_equal({"id"=>"faithfully-omg"}, hash)
+  end
+
+  def test_dash_with_custom_regexp
+    rs.draw do
+      match '/:artist/:song-omg', :constraints => { :song => /\d+/ }, :to => lambda { |env|
+        resp = JSON.dump env[ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+        [200, {}, [resp]]
+      }
+    end
+
+    hash = JSON.load get(URI('http://example.org/journey/123-omg'))
+    assert_equal({"artist"=>"journey", "song"=>"123"}, hash)
+    assert_equal 'Not Found', get(URI('http://example.org/journey/faithfully-omg'))
+  end
+
+  def test_pre_dash
+    rs.draw do
+      match '/:artist/omg-:song', :to => lambda { |env|
+        resp = JSON.dump env[ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+        [200, {}, [resp]]
+      }
+    end
+
+    hash = JSON.load get(URI('http://example.org/journey/omg-faithfully'))
+    assert_equal({"artist"=>"journey", "song"=>"faithfully"}, hash)
+  end
+
+  def test_pre_dash_with_custom_regexp
+    rs.draw do
+      match '/:artist/omg-:song', :constraints => { :song => /\d+/ }, :to => lambda { |env|
+        resp = JSON.dump env[ActionDispatch::Routing::RouteSet::PARAMETERS_KEY]
+        [200, {}, [resp]]
+      }
+    end
+
+    hash = JSON.load get(URI('http://example.org/journey/omg-123'))
+    assert_equal({"artist"=>"journey", "song"=>"123"}, hash)
+    assert_equal 'Not Found', get(URI('http://example.org/journey/omg-faithfully'))
+  end
+
   def test_regexp_precidence
     @rs.draw do
       match '/whois/:domain', :constraints => {