diff --git a/sanic/router.py b/sanic/router.py
index 7ae28f09..621d3733 100644
--- a/sanic/router.py
+++ b/sanic/router.py
@@ -151,16 +151,11 @@ class Router:
         properties = {"unhashable": None}
 
         def add_parameter(match):
-            # We could receive NAME or NAME:PATTERN
             name = match.group(1)
-            pattern = 'string'
-            if ':' in name:
-                name, pattern = name.split(':', 1)
+            name, _type, pattern = self.parse_parameter_string(name)
 
-            default = (str, pattern)
-            # Pull from pre-configured types
-            _type, pattern = REGEX_TYPES.get(pattern, default)
-            parameter = Parameter(name=name, cast=_type)
+            parameter = Parameter(
+                name=name, cast=_type)
             parameters.append(parameter)
 
             # Mark the whole route as unhashable if it has the hash key in it
diff --git a/tests/test_views.py b/tests/test_views.py
index 456b714d..afa52d8b 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -240,6 +240,7 @@ def test_composition_view_runs_methods_as_expected():
         request, response = sanic_endpoint_test(app, uri='/', method=method)
         assert response.text == 'second method'
 
+
 def test_composition_view_rejects_invalid_methods():
     app = Sanic('test_composition_view')