Fix generation of url regex for Go

tools/cmd/hints/marks_test.go

@@ -4,10 +4,29 @@ package hints
 
 import (
 	"fmt"
+	"kitty/tools/utils"
 	"testing"
+
+	"github.com/google/go-cmp/cmp"
 )
 
 var _ = fmt.Print
 
 func TestHintMarking(t *testing.T) {
+
+	opts := &Options{Type: "url"}
+	r := func(text string, url ...string) {
+		ptext := convert_text(text, 20)
+		marks, _, err := find_marks(ptext, opts)
+		if err != nil {
+			t.Fatalf("%#v failed with error: %s", text, err)
+		}
+		actual := utils.Map(func(m Mark) string { return m.Text }, marks)
+		if diff := cmp.Diff(url, actual); diff != "" {
+			t.Fatalf("%#v failed:\n%s", text, diff)
+		}
+	}
+
+	u := `http://test.me/`
+	r(u, u)
 }