Update member name regexp to support UTF8 alphabetic and numeric characters

see: https://ruby-doc.org/3.0.6/Regexp.html#class-Regexp-label-Character+Properties

Author: jgoodw1n

lib/jsonpath.rb

@@ -30,7 +30,7 @@ def initialize(path, opts = {})
     until scanner.eos?
       if (token = scanner.scan(/\$\B|@\B|\*|\.\./))
         @path << token
-      elsif (token = scanner.scan(/[$@a-zA-Z0-9:{}_-]+/))
+      elsif (token = scanner.scan(/[$@\p{Alnum}:{}_-]+/))
         @path << "['#{token}']"
       elsif (token = scanner.scan(/'(.*?)'/))
         @path << "[#{token}]"
@@ -85,7 +85,7 @@ def on(obj_or_str, opts = {})
     end
     a
   end
-  
+
   def self.fetch_all_path(obj)
     all_paths = ['$']
     find_path(obj, '$', all_paths, obj.class == Array)

test/test_jsonpath.rb

@@ -245,7 +245,7 @@ def test_use_first
   end
 
   def test_counting
-    assert_equal 57, JsonPath.new('$..*').on(@object).to_a.size
+    assert_equal 58, JsonPath.new('$..*').on(@object).to_a.size
   end
 
   def test_space_in_path
@@ -475,6 +475,11 @@ def test_support_underscore_in_member_names
                  JsonPath.new('$.store._links').on(@object)
   end
 
+  def test_support_for_umlauts_in_member_names
+    assert_equal [@object['store']['Übermorgen']],
+                 JsonPath.new('$.store.Übermorgen').on(@object)
+  end
+
   def test_dig_return_string
     assert_equal ['asdf'], JsonPath.new("$.store.book..tags[?(@ == 'asdf')]").on(@object)
     assert_equal [], JsonPath.new("$.store.book..tags[?(@ == 'not_asdf')]").on(@object)
@@ -1246,10 +1251,11 @@ def example_object
       },
       '@id' => 'http://example.org/store/42',
       '$meta-data' => 'whatevs',
+      'Übermorgen' => 'The day after tomorrow',
       '_links' => { 'self' => {} }
     } }
   end
-  
+
   def test_fetch_all_path
     data = {
       "foo" => nil,