Added regex tests to tox.

tests/__main__.py

@@ -7,7 +7,7 @@ from .test_trees import TestTrees
 from .test_tools import TestStandalone
 from .test_cache import TestCache
 from .test_reconstructor import TestReconstructor
-
+from .test_regex import TestRegex
 try:
     from .test_nearley.test_nearley import TestNearley
 except ImportError:

tests/test_regex.py

@@ -2,6 +2,7 @@
 from __future__ import absolute_import
 
 import logging
+import sys
 import unittest
 
 logging.basicConfig(level=logging.INFO)
@@ -10,8 +11,10 @@ from lark.lark import Lark
 
 
 class TestRegex(unittest.TestCase):
+    @unittest.skipIf(sys.version_info[0] == 2, 'Unicode and Python 2 do not place nicely together.')
     def test_unicode_class(self):
         "Tests that character classes from the `regex` module work correctly."
+        print(sys.version_info)
         g = Lark(r"""
                     ?start: NAME
                     NAME: ID_START ID_CONTINUE*
@@ -21,6 +24,7 @@ class TestRegex(unittest.TestCase):
 
         self.assertEqual(g.parse('வணக்கம்'), 'வணக்கம்')
 
+    @unittest.skipIf(sys.version_info[0] == 2, 'Unicode and Python 2 do not place nicely together.')
     def test_unicode_word(self):
         "Tests that a persistent bug in the `re` module works when `regex` is enabled."
         g = Lark(r"""