FIX: find tags with non-latin names (#6312)

lib/search.rb

@@ -372,7 +372,7 @@ class Search
     end
   end
 
-  advanced_filter(/^\#([a-zA-Z0-9\-:=]+)/) do |posts, match|
+  advanced_filter(/^\#([\p{L}0-9\-:=]+)/) do |posts, match|
 
     exact = true
 
@@ -468,11 +468,11 @@ class Search
     end
   end
 
-  advanced_filter(/^tags?:([a-zA-Z0-9,\-_+]+)/) do |posts, match|
+  advanced_filter(/^tags?:([\p{L}0-9,\-_+]+)/) do |posts, match|
     search_tags(posts, match, positive: true)
   end
 
-  advanced_filter(/\-tags?:([a-zA-Z0-9,\-_+]+)/) do |posts, match|
+  advanced_filter(/\-tags?:([\p{L}0-9,\-_+]+)/) do |posts, match|
     search_tags(posts, match, positive: false)
   end
 

spec/components/search_spec.rb

@@ -822,8 +822,9 @@ describe Search do
       expect(Search.execute("sams post #sub-category").posts.length).to eq(1)
 
       # tags
-      topic.tags = [Fabricate(:tag, name: 'alpha')]
+      topic.tags = [Fabricate(:tag, name: 'alpha'), Fabricate(:tag, name: 'привет')]
       expect(Search.execute('this is a test #alpha').posts.map(&:id)).to eq([post.id])
+      expect(Search.execute('this is a test #привет').posts.map(&:id)).to eq([post.id])
       expect(Search.execute('this is a test #beta').posts.size).to eq(0)
     end
 
@@ -864,6 +865,14 @@ describe Search do
         expect(Search.execute('tags:plants').posts.size).to eq(0)
       end
 
+      it 'can find posts with non-latin tag' do
+        topic = Fabricate(:topic)
+        topic.tags = [Fabricate(:tag, name: 'さようなら')]
+        post = Fabricate(:post, raw: 'Testing post', topic: topic)
+
+        expect(Search.execute('tags:さようなら').posts.map(&:id)).to eq([post.id])
+      end
+
       it 'can find posts with any tag from multiple tags' do
         Fabricate(:post)