Add expr source

pkg/expr/expr_test.go

@@ -0,0 +1,17 @@
+package expr
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMatchHost(t *testing.T) {
+	v, err := Run(`
+let url = "rtsp://user:pass@192.168.1.123/cam/realmonitor?...";
+let host = match(url, "//[^/]+")[0][2:];
+host
+`)
+	require.Nil(t, err)
+	require.Equal(t, "user:pass@192.168.1.123", v)
+}