FIX: Wrong discobot tutorial started for certain locales.

If a locale has triggers that start with the same word, our regexp will
always end up matching the first trigger. For example,

`start tutorial` and `start tutorial advanced`

To support the change, we have to make the match on triggers more
restrictive. `@discobot quote here` will no longer work like `@discobot
quote`.

plugins/discourse-narrative-bot/lib/discourse_narrative_bot/track_selector.rb

@@ -227,7 +227,7 @@ module DiscourseNarrativeBot
 
     def match_trigger?(trigger)
       discobot_username = self.discobot_user.username
-      regexp = Regexp.new("<a class=\"mention\".*>@#{discobot_username}</a> #{trigger}", 'i')
+      regexp = Regexp.new("<a class=\"mention\".*>@#{discobot_username}</a> #{trigger}</p>", 'i')
       match = @post.cooked.match(regexp)
 
       if @is_pm_to_bot

plugins/discourse-narrative-bot/spec/discourse_narrative_bot/track_selector_spec.rb

@@ -580,8 +580,7 @@ describe DiscourseNarrativeBot::TrackSelector do
             stub_request(:get, "http://api.forismatic.com/api/1.0/?format=json&lang=en&method=getQuote").
               to_return(status: 200, body: "{\"quoteText\":\"Be Like Water\",\"quoteAuthor\":\"Bruce Lee\"}")
 
-            ['@discobot quote', 'hello @discobot quote there'].each do |raw|
-              post.update!(raw: raw)
+            post.update!(raw: "@discobot quote")
             described_class.new(:reply, user, post_id: post.id).select
             new_post = Post.last
 
@@ -590,7 +589,6 @@ describe DiscourseNarrativeBot::TrackSelector do
               quote: "Be Like Water", author: "Bruce Lee"
             ))
           end
-          end
 
           describe 'when quote is requested incorrectly' do
             it 'should create the right reply' do
@@ -661,6 +659,32 @@ describe DiscourseNarrativeBot::TrackSelector do
               end.to_not change { Post.count }
             end
           end
+
+          describe "when new and advanced user triggers overlap" do
+            before do
+              @overrides = []
+
+              @overrides << TranslationOverride.upsert!(
+                I18n.locale, 'discourse_narrative_bot.new_user_narrative.reset_trigger', 'tutorial'
+              )
+
+              @overrides << TranslationOverride.upsert!(
+                I18n.locale, 'discourse_narrative_bot.advanced_user_narrative.reset_trigger', 'tutorial advanced'
+              )
+            end
+
+            after do
+              @overrides.each(&:destroy!)
+            end
+
+            it "should start the right track" do
+              post.update!(raw: "@discobot #{I18n.t('discourse_narrative_bot.track_selector.reset_trigger')} #{DiscourseNarrativeBot::AdvancedUserNarrative.reset_trigger}")
+
+              expect do
+                described_class.new(:reply, user, post_id: post.id).select
+              end.to change { Post.count }.by(2)
+            end
+          end
         end
       end
     end