vim nested hl

Vim/nested_hl/test.txt

@@ -0,0 +1,11 @@
+region_A{
+    keyword_a;
+    keyword_ab;
+
+    region_AB{
+        keyword_a;
+        keyword_ab;
+    }
+}
+
+keyword_a;

Vim/nested_hl/test.vim

@@ -0,0 +1,7 @@
+syn region A start="region_A{" end="}" transparent
+syn keyword myKeyword keyword_a contained containedin=A
+
+syn region AB start="region_AB{" end="}" transparent
+syn keyword myKeyword keyword_ab contained containedin=AB
+
+hi link myKeyword Statement