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System.out.println("".matches("^(.(?<!hello))*$"));
System.out.println("abc".matches("^(.(?<!hello))*$"));
System.out.println("ahellbc".matches("^(.(?<!hello))*$"));
System.out.println("abchello".matches("^(.(?<!hello))*$"));
System.out.println("hellottt".matches("^(.(?<!hello))*$"));
System.out.println("ahellobc".matches("^(.(?<!hello))*$"));
System.out.println("".matches("((?!hello).)*"));
System.out.println("abc".matches("((?!hello).)*"));
System.out.println("ahellbc".matches("((?!hello).)*"));
System.out.println("abchello".matches("((?!hello).)*"));
System.out.println("hellottt".matches("((?!hello).)*"));
System.out.println("ahellobc".matches("((?!hello).)*"));