Inline path template patterns as locals.

Addresses:
#1580 (comment)

Author: tseaver

gcloud/pubsub/_helpers.py

@@ -14,15 +14,9 @@
 
 """Helper functions for shared behavior."""
 
-import re
-
 from gcloud._helpers import _name_from_project_path
 
 
-_TOPIC_PATH_TEMPLATE = re.compile(
-    r'projects/(?P<project>\w+)/topics/(?P<name>\w+)')
-
-
 def topic_name_from_path(path, project):
     """Validate a topic URI path and get the topic name.
 
@@ -39,11 +33,8 @@ def topic_name_from_path(path, project):
              the project from the ``path`` does not agree with the
              ``project`` passed in.
     """
-    return _name_from_project_path(path, project, _TOPIC_PATH_TEMPLATE)
-
-
-_SUBSCRIPTION_PATH_TEMPLATE = re.compile(
-    r'projects/(?P<project>\w+)/subscriptions/(?P<name>\w+)')
+    template = r'projects/(?P<project>\w+)/topics/(?P<name>\w+)'
+    return _name_from_project_path(path, project, template)
 
 
 def subscription_name_from_path(path, project):
@@ -62,4 +53,5 @@ def subscription_name_from_path(path, project):
              the project from the ``path`` does not agree with the
              ``project`` passed in.
     """
-    return _name_from_project_path(path, project, _SUBSCRIPTION_PATH_TEMPLATE)
+    template = r'projects/(?P<project>\w+)/subscriptions/(?P<name>\w+)'
+    return _name_from_project_path(path, project, template)