diff --git a/.gitignore b/.gitignore
index df2b903..563155a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,13 @@
 __pycache__/
-test.py
\ No newline at end of file
+.gitignore
+.idea
+*#
+*.iml
+*.ipr
+*.iws
+*.jar
+*.sw?
+*~
+.#*
+.*.md.html
+
diff --git a/nfa/construction.py b/nfa/construction.py
index 3984b69..ce0cb13 100644
--- a/nfa/construction.py
+++ b/nfa/construction.py
@@ -109,10 +109,13 @@ def nfa_set_nega_char(pair_out):
 
 
 def char_set_inversion(input_set):
+    origin = set(input_set)
     for i in range(ASCII_COUNT):
         c = chr(i)
         if c not in input_set:
             input_set.add(c)
+    for c in origin:
+        input_set.remove(c)
 
 
 def dodash(input_set):
diff --git a/test/test.py b/test/test.py
new file mode 100644
index 0000000..23b7d86
--- /dev/null
+++ b/test/test.py
@@ -0,0 +1,30 @@
+import unittest
+from regex import Regex
+
+class RegexMaterial(object):
+    def __init__(self, str, pattern, result):
+        self.str = str
+        self.pattern = pattern
+        self.result = result
+
+testLists = []
+testLists.append(RegexMaterial("a", "a", True))
+testLists.append(RegexMaterial("a", "b+", False))
+testLists.append(RegexMaterial("b", "b+", True))
+testLists.append(RegexMaterial("ab", "(ab|cd)", True))
+testLists.append(RegexMaterial("THISISREGEXTEST", "([A-Z]*|[0-9]+)", True))
+testLists.append(RegexMaterial("abbbbb", "[^c]+", True))
+testLists.append(RegexMaterial("ccccc", "[^c]+", False))
+testLists.append(RegexMaterial("123", "[1-3]+", True))
+
+class TestRegex(unittest.TestCase):
+    def test(self):
+        for t in testLists:
+            print("str is " + t.str + ", pattern is " + t.pattern + ", expected " + str(t.result))
+            regex = Regex(t.str, t.pattern)
+            self.assertEqual(regex.match(), t.result)
+
+
+
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file