Correct regex usage

setuptools/package_index.py

@@ -140,7 +140,7 @@ def interpret_distro_name(
     parts = basename.split('-')
     if not py_version:
         for i,p in enumerate(parts[2:]):
-            if p.match('py\d\.\d'):
+            if re.match('py\d\.\d$', p):
                 # It's a bdist_dumb, not an sdist -- bail out
                 return