Fixed regex validation for version tag

Author: tleonhardt

tasks.py

@@ -270,9 +270,9 @@ def validatetag(context: Context) -> None:
     git_tag = result.stdout.rstrip()
 
     # Validate that the Git tag appears to be a valid version number
-    ver_regex = re.compile(r'(\d+)\.(\d+)\.(\d+)(a|b|rc)(\d+)')
-    match = ver_regex.fullmatch(git_tag)
-    if match is None:
+    ver_regex = re.compile(r'(\d+)\.(\d+)\.(\d+)((a|b|rc)(\d+))?')
+    found = ver_regex.fullmatch(git_tag)
+    if found is None:
         print(f'Tag {git_tag!r} does not appear to be a valid version number')
         sys.exit(-1)
     else: