tenseleyflow/shithub / fbcae7f

-// extractMentions returns deduplicated @username tokens from body.

-// Used by handlers / future notifications. Bounded by username regex.

-var reMention = regexp.MustCompile(`(?:^|[^\w])@([A-Za-z0-9][A-Za-z0-9_-]{0,38})\b`)

-

-func extractMentions(body string) []string {

-	if body == "" {

-		return nil

-	}

-	seen := map[string]struct{}{}

-	out := []string{}

-	for _, m := range reMention.FindAllStringSubmatch(body, -1) {

-		name := m[1]

-		if _, dup := seen[name]; dup {

-			continue

-		}

-		seen[name] = struct{}{}

-		out = append(out, name)

-	}

-	return out

-}

-func TestExtractMentions(t *testing.T) {

-	t.Parallel()

-	got := extractMentions("hi @alice and @bob, also @alice again — but not foo@example.com or a@b")

-	// `a@b` doesn't match (single-char user is fine but there's no

-	// leading word-boundary punctuation that's not a `@` itself, and

-	// our regex requires the `@` to be preceded by a non-word char or

-	// the start of input — `b a@b` would match `b` itself but `b@`

-	// fails the regex).

-	want := []string{"alice", "bob"}

-	if !reflect.DeepEqual(got, want) {

-		t.Errorf("got %v, want %v", got, want)

-	}

-}