Use str.isidentifier instead of regex

qgis-app/plugins/validator.py

@@ -245,11 +245,12 @@ def validator(package, is_new: bool = False):
             )
         )
     # Check if package_name is PEP 8 compliant
-    if is_new and not re.match(r"^[a-z_][a-z0-9_]*$", package_name):
+    if is_new and not package_name.isidentifier():
         raise ValidationError(
             _(
                 "The name of the top level directory inside the zip package must be PEP 8 compliant: "
-                "lowercase with words separated by underscores, and must start with a letter or underscore."
+                "a valid Python identifier, which means it must start with a letter or underscore, "
+                "and can only contain letters, digits, and underscores."
             )
         )