fixed issue #968, IS_MATCH validator bug with unicode, thanks alex0834

gluon/validators.py

@@ -200,7 +200,10 @@ class IS_MATCH(Validator):
         self.is_unicode = is_unicode
 
     def __call__(self, value):
-        if self.is_unicode and not isinstance(value, unicode):
+        if self.is_unicode:
+            if isinstance(value,unicode):
+                match = self.regex.search(value)
+            else:
                 match = self.regex.search(str(value).decode('utf8'))
         else:
             match = self.regex.search(str(value))