Fix non-english characters delete on tags (#2579)

app/lib/acts_as_taggable_on/tag_parser.rb

@@ -13,7 +13,7 @@ module ActsAsTaggableOn
       return [] if string.blank?
 
       string.downcase.split(",").map do |t|
-        t.strip.delete(" ").gsub(/[^0-9a-z]/i, "")
+        t.strip.delete(" ").gsub(/[^[:alnum:]]/i, "")
       end
     end
 

spec/lib/acts_as_taggable_on/tag_parser_spec.rb

@@ -25,6 +25,10 @@ RSpec.describe ActsAsTaggableOn::TagParser do
       tags = ["w0rd", "app|3", "&!tes4@#$%^&*"]
       expect(create_tag_parser(tags)).to eq(%w[w0rd app3 tes4])
     end
+    it "allows non-english characters" do
+      tags = %w[Optimización Καλημέρα Français]
+      expect(create_tag_parser(tags)).to eq(%w[optimización καλημέρα français])
+    end
     it "returns nothing if nothing is recieved" do
       expect(create_tag_parser([])).to eq([])
     end