Improve _is_backport

pyproject.toml

@@ -34,6 +34,9 @@ flake8 = "^7"
 mypy = "^1.5"
 pytest-cov = "^5.0.0"
 
+[tool.black]
+line-length = 88
+
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"

tagbot/action/changelog.py

@@ -70,24 +70,24 @@ def _previous_release(self, version_tag: str) -> Optional[GitRelease]:
     def _is_backport(self, version: str) -> bool:
         """Determine whether or not the version is a backport."""
         try:
-            # Regular expression to match version tags with or without prefix
-            version_pattern = re.compile(r"^(.*[-v]?)(\d+\.\d+\.\d+)$")
+            version_pattern = re.compile(
+                r"^(.*?)[-v]?(\d+\.\d+\.\d+(?:\.\d+)*)(?:[-+].+)?$"
+            )
 
-            # Extract the version number from the input
+            # Extract any package name prefix and version number from the input
             match = version_pattern.match(version)
             if not match:
-                raise ValueError("Invalid version format: ${version}")
-
-            # Extract the base version without the 'v' prefix
+                raise ValueError(f"Invalid version format: {version}")
+            package_name = match.group(1)
             cur_ver = VersionInfo.parse(match.group(2))
-            package_name = match.group(1).strip("-v")
 
             for r in self._repo._repo.get_releases():
                 tag_match = version_pattern.match(r.tag_name)
                 if not tag_match:
                     continue
 
-                tag_package_name = tag_match.group(1).strip("-v")
+                tag_package_name = tag_match.group(1)
+
                 if tag_package_name != package_name:
                     continue