diff --git a/jsonpath_rw_ext/parser.py b/jsonpath_rw_ext/parser.py
index db265e5..07c5382 100644
--- a/jsonpath_rw_ext/parser.py
+++ b/jsonpath_rw_ext/parser.py
@@ -28,9 +28,8 @@ class ExtendedJsonPathLexer(lexer.JsonPathLexer):
     """Custom LALR-lexer for JsonPath"""
     literals = lexer.JsonPathLexer.literals + ['?', '@']
     tokens = (parser.JsonPathLexer.tokens +
-              ['FILTER_OP', 'FILTER_VALUE', 'SORT_DIRECTION'])
+              ['FILTER_OP', 'SORT_DIRECTION'])
 
-    t_FILTER_VALUE = r'\w+'
     t_FILTER_OP = r'(==?|<=|>=|!=|<|>)'
 
     def t_SORT_DIRECTION(self, t):
@@ -66,7 +65,6 @@ class ExtentedJsonPathParser(parser.JsonPathParser):
 
     def p_expression(self, p):
         """expression : jsonpath
-                      | jsonpath FILTER_OP FILTER_VALUE
                       | jsonpath FILTER_OP ID
                       | jsonpath FILTER_OP NUMBER
         """
diff --git a/jsonpath_rw_ext/tests/test_jsonpath_rw_ext.py b/jsonpath_rw_ext/tests/test_jsonpath_rw_ext.py
index 108db97..0ff7a47 100644
--- a/jsonpath_rw_ext/tests/test_jsonpath_rw_ext.py
+++ b/jsonpath_rw_ext/tests/test_jsonpath_rw_ext.py
@@ -61,6 +61,10 @@ class TestJsonpath_rw_ext(testscenarios.WithScenarios,
                                        data={'objects': [{'cow': 'moo'},
                                                          {'cat': 'neigh'}]},
                                        target=[{'cow': 'moo'}])),
+        ('filter_exists_syntax4', dict(string='objects[?(@."cow!?cat")]',
+                                       data={'objects': [{'cow!?cat': 'moo'},
+                                                         {'cat': 'neigh'}]},
+                                       target=[{'cow!?cat': 'moo'}])),
         ('filter_eq1', dict(string='objects[?cow="moo"]',
                             data={'objects': [{'cow': 'moo'},
                                               {'cow': 'neigh'},