diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 09e92c2..97a9c96 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,6 +11,9 @@ jobs:
         - '2.5'
         - '2.6'
         - '2.7'
+        - '3.2'
+        - '3.1'
+        - '3.0'
         - ruby-head
         - jruby-head
         - truffleruby-head
diff --git a/lib/jsonpath/enumerable.rb b/lib/jsonpath/enumerable.rb
index 75fb629..29660ab 100644
--- a/lib/jsonpath/enumerable.rb
+++ b/lib/jsonpath/enumerable.rb
@@ -154,8 +154,9 @@ def process_function_or_literal(exp, default = nil)
       return Integer(exp) if exp[0] != '('
       return nil unless @_current_node
 
-      identifiers = /@?((?<!\d)\.(?!\d)(\w+))+/.match(exp)
-      if !identifiers.nil? && !@_current_node.methods.include?(identifiers[2].to_sym)
+      identifiers = /@?(((?<!\d)\.(?!\d)(\w+))|\['(.*?)'\])+/.match(exp)
+      # to filter arrays with known/unknown name.
+      if (!identifiers.nil? && !(@_current_node.methods.include?(identifiers[2]&.to_sym) || @_current_node.methods.include?(identifiers[4]&.to_sym)))
         exp_to_eval = exp.dup
         begin
           return JsonPath::Parser.new(@_current_node, @options).parse(exp_to_eval)
diff --git a/test/test_jsonpath.rb b/test/test_jsonpath.rb
index db8a5e4..6940f20 100644
--- a/test/test_jsonpath.rb
+++ b/test/test_jsonpath.rb
@@ -885,13 +885,17 @@ def test_complex_nested_grouping
     path = "$..book[?((@['author'] == 'Evelyn Waugh' || @['author'] == 'Herman Melville') && (@['price'] == 33 || @['price'] == 9))]"
     assert_equal [@object['store']['book'][2]], JsonPath.new(path).on(@object)
   end
-
-  def test_complex_nested_grouping_unmatched_parent
-    path = "$..book[?((@['author'] == 'Evelyn Waugh' || @['author'] == 'Herman Melville' && (@['price'] == 33 || @['price'] == 9))]"
-    err = assert_raises(ArgumentError, 'should have raised an exception') { JsonPath.new(path).on(@object) }
-    assert_match(/unmatched parenthesis in expression: \(\(false \|\| false && \(false \|\| true\)\)/, err.message)
+  
+  def test_nested_with_unknown_key
+    path = "$..[?(@.price == 9 || @.price == 33)].title"
+    assert_equal ["Sayings of the Century", "Moby Dick", "Sayings of the Century", "Moby Dick"], JsonPath.new(path).on(@object)
   end
 
+  def test_nested_with_unknown_key_filtered_array
+    path = "$..[?(@['price'] == 9 || @['price'] == 33)].title"
+    assert_equal ["Sayings of the Century", "Moby Dick", "Sayings of the Century", "Moby Dick"], JsonPath.new(path).on(@object)
+  end
+  
   def test_runtime_error_frozen_string
     skip('in ruby version below 2.2.0 this error is not raised') if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('2.2.0') || Gem::Version.new(RUBY_VERSION) > Gem::Version::new('2.6')
     json = '