Fix version-extraction regexp

Fixes https://github.com/matrix-org/matrix-doc/issues/982

scripts/dump-swagger.py

@@ -49,7 +49,7 @@ else:
 release_label = sys.argv[2] if len(sys.argv) > 2 else "unstable"
 
 major_version = release_label
-match = re.match("^(r\d)+(\.\d+)*$", major_version)
+match = re.match("^(r\d+)(\.\d+)*$", major_version)
 if match:
     major_version = match.group(1)
 

scripts/gendoc.py

@@ -469,7 +469,7 @@ def list_targets():
 
 def extract_major(s):
     major_version = s
-    match = re.match("^(r\d)+(\.\d+)*$", s)
+    match = re.match("^(r\d+)(\.\d+)*$", s)
     if match:
         major_version = match.group(1)
     return major_version