Recognize more characters in crossreferenced repo name (#3413)

Author: lafriks

modules/markup/html.go

@@ -43,7 +43,7 @@ var (
 	IssueAlphanumericPattern = regexp.MustCompile(`( |^|\()[A-Z]{1,10}-[1-9][0-9]*\b`)
 	// CrossReferenceIssueNumericPattern matches string that references a numeric issue in a different repository
 	// e.g. gogits/gogs#12345
-	CrossReferenceIssueNumericPattern = regexp.MustCompile(`( |^)[0-9a-zA-Z]+/[0-9a-zA-Z]+#[0-9]+\b`)
+	CrossReferenceIssueNumericPattern = regexp.MustCompile(`( |^)[0-9a-zA-Z-_\.]+/[0-9a-zA-Z-_\.]+#[0-9]+\b`)
 
 	// Sha1CurrentPattern matches string that represents a commit SHA, e.g. d8a994ef243349f321568f9e36d5c3f444b99cae
 	// Although SHA1 hashes are 40 chars long, the regex matches the hash from 7 to 40 chars in length

modules/markup/html_test.go

@@ -285,6 +285,9 @@ func TestRender_CrossReferences(t *testing.T) {
 	test(
 		"gogits/gogs#12345",
 		`<p><a href="`+URLJoin(AppURL, "gogits", "gogs", "issues", "12345")+`" rel="nofollow">gogits/gogs#12345</a></p>`)
+	test(
+		"go-gitea/gitea#12345",
+		`<p><a href="`+URLJoin(AppURL, "go-gitea", "gitea", "issues", "12345")+`" rel="nofollow">go-gitea/gitea#12345</a></p>`)
 }
 
 func TestRender_FullIssueURLs(t *testing.T) {