Correctly link URLs to users/repos with dashes, dots or underscores (#18890) (#18908)

* Add tests for references with dashes

This commit adds tests for full URLs referencing repos names and user
names containing a dash.

* Extend regex to match URLs to repos/users with dashes

Co-authored-by: Alexander Neumann <62751754+rtpt-alexanderneumann@users.noreply.github.com>

modules/markup/html.go

@@ -99,7 +99,7 @@ var issueFullPatternOnce sync.Once
 func getIssueFullPattern() *regexp.Regexp {
 	issueFullPatternOnce.Do(func() {
 		issueFullPattern = regexp.MustCompile(regexp.QuoteMeta(setting.AppURL) +
-			`\w+/\w+/(?:issues|pulls)/((?:\w{1,10}-)?[1-9][0-9]*)([\?|#](\S+)?)?\b`)
+			`[\w_.-]+/[\w_.-]+/(?:issues|pulls)/((?:\w{1,10}-)?[1-9][0-9]*)([\?|#](\S+)?)?\b`)
 	})
 	return issueFullPattern
 }

modules/markup/html_test.go

@@ -95,6 +95,15 @@ func TestRender_CrossReferences(t *testing.T) {
 	test(
 		"/home/gitea/go-gitea/gitea#12345",
 		`<p>/home/gitea/go-gitea/gitea#12345</p>`)
+	test(
+		util.URLJoin(TestAppURL, "gogitea", "gitea", "issues", "12345"),
+		`<p><a href="`+util.URLJoin(TestAppURL, "gogitea", "gitea", "issues", "12345")+`" class="ref-issue" rel="nofollow">gogitea/gitea#12345</a></p>`)
+	test(
+		util.URLJoin(TestAppURL, "go-gitea", "gitea", "issues", "12345"),
+		`<p><a href="`+util.URLJoin(TestAppURL, "go-gitea", "gitea", "issues", "12345")+`" class="ref-issue" rel="nofollow">go-gitea/gitea#12345</a></p>`)
+	test(
+		util.URLJoin(TestAppURL, "gogitea", "some-repo-name", "issues", "12345"),
+		`<p><a href="`+util.URLJoin(TestAppURL, "gogitea", "some-repo-name", "issues", "12345")+`" class="ref-issue" rel="nofollow">gogitea/some-repo-name#12345</a></p>`)
 }
 
 func TestMisc_IsSameDomain(t *testing.T) {