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String s = "adsd{aaa},{bbb}he";
System.out.println(s.matches("[^{}]*(\\{(?:aaa|bbb|ccc|ddd)\\}[^{}]*){1,5}"));
String s = "adsd{target},he";
System.out.println(s.matches("[^{}]*(\\{target}[^{}]*){1,5}"));
String s = "adsd{aadf}d,{12}{}";
System.out.println(s.matches("[^{}]*(\\{.+?\\}[^{}]*){1,5}"));