improve version regex

Author: StellaHuang95

src/managers/builtin/pipUtils.ts

@@ -30,8 +30,10 @@ function validatePyprojectToml(toml: tomljs.JsonMap): string | undefined {
         const version = (toml.project as tomljs.JsonMap).version as string;
         // PEP 440 version regex.  Versions must follow PEP 440 format (e.g., "1.0.0", "2.1a3").
         // See https://peps.python.org/pep-0440/
+        // This regex is adapted from the official python 'packaging' library:
+        // https://github.com/pypa/packaging/blob/main/src/packaging/version.py
         const versionRegex =
-            /^([0-9]+!)?(0|[1-9][0-9]*)(\.(0|[1-9][0-9]*))*((a|b|c|rc)([0-9]+)?)?(\.post([0-9]+)?)?(\.dev([0-9]+)?)?(\+[a-zA-Z0-9._-]+)?$/;
+            /^v?([0-9]+!)?([0-9]+(?:\.[0-9]+)*)(?:[-_.]?(a|b|c|rc|alpha|beta|pre|preview)[-_.]?([0-9]+)?)?(?:(?:-([0-9]+))|(?:[-_.]?(post|rev|r)[-_.]?([0-9]+)?))?(?:[-_.]?(dev)[-_.]?([0-9]+)?)?(?:\+([a-z0-9]+(?:[-_.][a-z0-9]+)*))?$/i;
         if (!versionRegex.test(version)) {
             return l10n.t('Invalid version "{0}" in pyproject.toml.', version);
         }