#836: Allow for standard Crossbar a.c..d style pattern URIs to be used with Pattern

autobahn/wamp/uri.py

@@ -160,6 +160,7 @@ class Pattern(object):
         components = uri.split('.')
         pl = []
         nc = {}
+        group_count = 0
         for i in range(len(components)):
             component = components[i]
 
@@ -185,6 +186,7 @@ class Pattern(object):
                     raise Exception("logic error")
 
                 pl.append("(?P<{0}>[a-z0-9_]+)".format(name))
+                group_count += 1
                 continue
 
             match = Pattern._URI_NAMED_COMPONENT.match(component)
@@ -195,6 +197,7 @@ class Pattern(object):
 
                 nc[name] = str
                 pl.append("(?P<{0}>[a-z0-9_]+)".format(name))
+                group_count += 1
                 continue
 
             match = Pattern._URI_COMPONENT.match(component)
@@ -202,6 +205,12 @@ class Pattern(object):
                 pl.append(component)
                 continue
 
+            if component == '':
+                group_count += 1
+                pl.append("([a-z0-9][a-z0-9_\-]*)")
+                nc[group_count] = str
+                continue
+
             raise Exception("invalid URI")
 
         if nc: