2 files changed, 46 insertions, 0 deletions
diff --git a/test/lex_optimize4.py b/test/lex_optimize4.py
new file mode 100644
index 0000000..cc6e2a9
--- /dev/null
+++ b/test/lex_optimize4.py
@@ -0,0 +1,26 @@
+# -----------------------------------------------------------------------------
+# lex_optimize4.py
+# -----------------------------------------------------------------------------
+import re
+import sys
+
+if ".." not in sys.path: sys.path.insert(0,"..")
+import ply.lex as lex
+
+tokens = [
+    "PLUS",
+    "MINUS",
+    "NUMBER",
+    ]
+
+t_PLUS = r'\+?'
+t_MINUS = r'-'
+t_NUMBER = r'(\d+)'
+
+def t_error(t):
+    pass
+
+
+# Build the lexer
+lex.lex(optimize=True, lextab="opt4tab", reflags=re.UNICODE)
+lex.runmain(data="3+4")
diff --git a/test/testlex.py b/test/testlex.py
index 3880f6f..83070a7 100755
--- a/test/testlex.py
+++ b/test/testlex.py
@@ -514,6 +514,26 @@ class LexBuildOptionTests(unittest.TestCase):
         except OSError:
             pass
 
+    def test_lex_optimize4(self):
+
+        # Regression test to make sure that reflags works correctly
+        # on Python 3.
+
+        for extension in ['py', 'pyc']:
+            try:
+                os.remove("opt4tab.{0}".format(extension))
+            except OSError:
+                pass
+
+        run_import("lex_optimize4")
+        run_import("lex_optimize4")
+
+        for extension in ['py', 'pyc']:
+            try:
+                os.remove("opt4tab.{0}".format(extension))
+            except OSError:
+                pass
+
     def test_lex_opt_alias(self):
         try:
             os.remove("aliastab.py")