Add get_original_route to complement get_regex_pattern

rest_framework/compat.py

@@ -29,7 +29,11 @@ except ImportError:
     )
 
 
-def get_regex_pattern(urlpattern):
+def get_original_route(urlpattern):
+    """
+    Get the original route/regex that was typed in by the user into the path(), re_path() or url() directive. This
+    is in contrast with get_regex_pattern below, which for RoutePattern returns the raw regex generated from the path().
+    """
     if hasattr(urlpattern, 'pattern'):
         # Django 2.0
         return str(urlpattern.pattern)
@@ -38,6 +42,19 @@ def get_regex_pattern(urlpattern):
         return urlpattern.regex.pattern
 
 
+def get_regex_pattern(urlpattern):
+    """
+    Get the raw regex out of the urlpattern's RegexPattern or RoutePattern. This is always a regular expression,
+    unlike get_original_route above.
+    """
+    if hasattr(urlpattern, 'pattern'):
+        # Django 2.0
+        return urlpattern.pattern.regex.pattern
+    else:
+        # Django < 2.0
+        return urlpattern.regex.pattern
+
+
 def make_url_resolver(regex, urlpatterns):
     try:
         # Django 2.0

rest_framework/schemas/generators.py

@@ -16,7 +16,7 @@ from django.utils import six
 
 from rest_framework import exceptions
 from rest_framework.compat import (
-    URLPattern, URLResolver, coreapi, coreschema, get_regex_pattern
+    URLPattern, URLResolver, coreapi, coreschema, get_original_route
 )
 from rest_framework.request import clone_request
 from rest_framework.settings import api_settings
@@ -170,7 +170,7 @@ class EndpointEnumerator(object):
         api_endpoints = []
 
         for pattern in patterns:
-            path_regex = prefix + get_regex_pattern(pattern)
+            path_regex = prefix + get_original_route(pattern)
             if isinstance(pattern, URLPattern):
                 path = self.get_path_from_regex(path_regex)
                 callback = pattern.callback