Fix issue 198: resolve touching factor groups

2 files changed, 14 insertions, 1 deletions

diff --git a/tests/test_config.py b/tests/test_config.py
index 1c58a4a..229f035 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -960,6 +960,19 @@ class TestConfigTestEnv:
         assert configs["py27"].setenv["X"] == "1"
         assert "X" not in configs["py26"].setenv
 
+    @pytest.mark.issue198
+    def test_factors_groups_touch(self, newconfig):
+        inisource="""
+            [tox]
+            envlist = {a,b}{-x,}
+
+            [testenv]
+            deps=
+                a,b,x,y: dep
+        """
+        configs = newconfig([], inisource).envconfigs
+        assert set(configs.keys()) == set(['a', 'a-x', 'b', 'b-x'])
+
     def test_period_in_factor(self, newconfig):
         inisource="""
             [tox]
diff --git a/tox/_config.py b/tox/_config.py
index 41f02ec..82154e3 100644
--- a/tox/_config.py
+++ b/tox/_config.py
@@ -456,7 +456,7 @@ def _split_factor_expr(expr):
 
 def _expand_envstr(envstr):
     # split by commas not in groups
-    tokens = re.split(r'(\{[^}]+\})|,', envstr)
+    tokens = re.split(r'((?:\{[^}]+\})+)|,', envstr)
     envlist = [''.join(g).strip()
                for k, g in itertools.groupby(tokens, key=bool) if k]