Merge pull request #1710 from mattermost/plt-1498

PLT-1498 Add hashtag testing and allow special german characters

doc/developer/tests/test-hashtags.md

@@ -0,0 +1,20 @@
+# Hashtag Testing
+
+Hashtags in Mattermosts should render as specified below. 
+
+#### These strings should auto-link:
+
+#testing
+#testing123
+#test-test
+#test_test
+#test! (punctuation should be excluded from linking)
+#test1 #test2
+#hüllo
+
+#### These strings should not auto-link:
+
+#123test
+#?test
+#-test
+

model/utils.go

@@ -273,9 +273,9 @@ func Etag(parts ...interface{}) string {
 	return etag
 }
 
-var validHashtag = regexp.MustCompile(`^(#[A-Za-z]+[A-Za-z0-9_\-]*[A-Za-z0-9])$`)
-var puncStart = regexp.MustCompile(`^[.,()&$!\[\]{}':;\\]+`)
-var puncEnd = regexp.MustCompile(`[.,()&$#!\[\]{}';\\]+$`)
+var validHashtag = regexp.MustCompile(`^(#[A-Za-zäöüÄÖÜß]+[A-Za-z0-9äöüÄÖÜß_\-]*[A-Za-z0-9äöüÄÖÜß])$`)
+var puncStart = regexp.MustCompile(`^[.,()&$!\?\[\]{}':;\\]+`)
+var puncEnd = regexp.MustCompile(`[.,()&$#!\?\[\]{}';\\]+$`)
 
 func ParseHashtags(text string) (string, string) {
 	words := strings.Fields(text)

model/utils_test.go

@@ -81,3 +81,27 @@ func TestEtag(t *testing.T) {
 		t.Fatal()
 	}
 }
+
+var hashtags map[string]string = map[string]string{
+	"#test":         "#test",
+	"test":          "",
+	"#test123":      "#test123",
+	"#123test123":   "",
+	"#test-test":    "#test-test",
+	"#test?":        "#test",
+	"hi #there":     "#there",
+	"#bug #idea":    "#bug #idea",
+	"#bug or #gif!": "#bug #gif",
+	"#hüllo":        "#hüllo",
+	"#?test":        "",
+	"#-test":        "",
+	"#yo_yo":        "#yo_yo",
+}
+
+func TestParseHashtags(t *testing.T) {
+	for input, output := range hashtags {
+		if o, _ := ParseHashtags(input); o != output {
+			t.Fatal("expected=" + output + " actual=" + o)
+		}
+	}
+}

web/react/utils/text_formatting.jsx

@@ -256,7 +256,7 @@ function autolinkHashtags(text, tokens) {
         return prefix + alias;
     }
 
-    return output.replace(/(^|\W)(#[a-zA-Z][a-zA-Z0-9.\-_]*)\b/g, replaceHashtagWithToken);
+    return output.replace(/(^|\W)(#[a-zA-ZäöüÄÖÜß][a-zA-Z0-9äöüÄÖÜß.\-_]*)\b/g, replaceHashtagWithToken);
 }
 
 const puncStart = /^[.,()&$!\[\]{}':;\\]+/;