diff --git a/importlib_metadata/__init__.py b/importlib_metadata/__init__.py
index 08f7a9ea..7713e1e0 100644
--- a/importlib_metadata/__init__.py
+++ b/importlib_metadata/__init__.py
@@ -161,8 +161,8 @@ class EntryPoint(DeprecatedTuple):
 
     pattern = re.compile(
         r'(?P<module>[\w.]+)\s*'
-        r'(:\s*(?P<attr>[\w.]+))?\s*'
-        r'(?P<extras>\[.*\])?\s*$'
+        r'(:\s*(?P<attr>[\w.]+)\s*)?'
+        r'((?P<extras>\[.*\])\s*)?$'
     )
     """
     A regular expression describing the syntax for an entry point,