fixup! feat(config): Allow ranges in envlist

Author: mimre25

src/tox/config/loader/ini/factor.py

@@ -66,7 +66,7 @@ def find_factor_groups(value: str) -> Iterator[list[tuple[str, bool]]]:
         yield result
 
 
-_FACTOR_RE = re.compile(r"!?[\w._][\w._-]*")
+_FACTOR_RE = re.compile(r"(?:!?[\w._][\w._-]*|^$)")
 
 
 def expand_env_with_negation(value: str) -> Iterator[str]:

tests/config/loader/ini/test_factor.py

@@ -213,6 +213,13 @@ def test_factor_config_no_env_list_creates_env(tox_ini_conf: ToxIniCreator) -> N
         ),
         ("py3{10-11},a{1-2}-b{3-4}", ["py310", "py311", "a1-b3", "a1-b4", "a2-b3", "a2-b4"]),
         ("py3{13-11}", ["py313", "py312", "py311"]),
+        ("py3{-11}", ["py3-11"]),
+        ("foo{11-}", ["foo11-"]),
+        ("foo{a-}", ["fooa-"]),
+        ("foo{-a}", ["foo-a"]),
+        ("foo{a-11}", ["fooa-11"]),
+        ("foo{13-a}", ["foo13-a"]),
+        ("foo{a-b}", ["fooa-b"]),
     ],
 )
 def test_env_list_expands_ranges(env_list: str, expected_envs: list[str], tox_ini_conf: ToxIniCreator) -> None: