3 files changed, 15 insertions, 7 deletions
diff --git a/lib/gitlab/chat_commands/issue_show.rb b/lib/gitlab/chat_commands/issue_show.rb
index f5bceb038e5..2a45d49cf6b 100644
--- a/lib/gitlab/chat_commands/issue_show.rb
+++ b/lib/gitlab/chat_commands/issue_show.rb
@@ -2,7 +2,7 @@ module Gitlab
   module ChatCommands
     class IssueShow < IssueCommand
       def self.match(text)
-        /\Aissue\s+show\s+(?<iid>\d+)/.match(text)
+        /\Aissue\s+show\s+#{Issue.reference_prefix}?(?<iid>\d+)/.match(text)
       end
 
       def self.help_message
diff --git a/lib/gitlab/identifier.rb b/lib/gitlab/identifier.rb
index c5acf18beb5..94678b6ec40 100644
--- a/lib/gitlab/identifier.rb
+++ b/lib/gitlab/identifier.rb
@@ -21,10 +21,8 @@ module Gitlab
 
       return if !commit || !commit.author_email
 
-      email = commit.author_email
-
-      identify_with_cache(:email, email) do
-        User.find_by_any_email(email)
+      identify_with_cache(:email, commit.author_email) do
+        commit.author
       end
     end
 
diff --git a/lib/gitlab/regex.rb b/lib/gitlab/regex.rb
index c12358ceef4..a06cf6a989c 100644
--- a/lib/gitlab/regex.rb
+++ b/lib/gitlab/regex.rb
@@ -8,8 +8,10 @@ module Gitlab
     # allow non-regex validatiions, etc), `NAMESPACE_REGEX_STR_SIMPLE` serves as a Javascript-compatible version of
     # `NAMESPACE_REGEX_STR`, with the negative lookbehind assertion removed. This means that the client-side validation
     # will pass for usernames ending in `.atom` and `.git`, but will be caught by the server-side validation.
-    NAMESPACE_REGEX_STR_SIMPLE = '[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*[a-zA-Z0-9_\-]|[a-zA-Z0-9_]'.freeze
+    PATH_REGEX_STR = '[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*'.freeze
+    NAMESPACE_REGEX_STR_SIMPLE = PATH_REGEX_STR + '[a-zA-Z0-9_\-]|[a-zA-Z0-9_]'.freeze
     NAMESPACE_REGEX_STR = '(?:' + NAMESPACE_REGEX_STR_SIMPLE + ')(?<!\.git|\.atom)'.freeze
+    PROJECT_REGEX_STR = PATH_REGEX_STR + '(?<!\.git|\.atom)'.freeze
 
     def namespace_regex
       @namespace_regex ||= /\A#{NAMESPACE_REGEX_STR}\z/.freeze
@@ -42,7 +44,15 @@ module Gitlab
     end
 
     def project_path_regex
-      @project_path_regex ||= /\A[a-zA-Z0-9_.][a-zA-Z0-9_\-\.]*(?<!\.git|\.atom)\z/.freeze
+      @project_path_regex ||= /\A#{PROJECT_REGEX_STR}\z/.freeze
+    end
+
+    def project_route_regex
+      @project_route_regex ||= /#{PROJECT_REGEX_STR}/.freeze
+    end
+
+    def project_git_route_regex
+      @project_route_git_regex ||= /#{PATH_REGEX_STR}\.git/.freeze
     end
 
     def project_path_regex_message