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public class StringRegionMatch {
   public static void main(String[] args) {
      String first_str = "Welcome to Microsoft";
      String second_str = "I work with microsoft";
      boolean match1 = first_str.
      regionMatches(11, second_str, 12, 9);
      boolean match2 = first_str.
      regionMatches(true, 11, second_str, 12, 9); // The first parameter true indicates case insensitivity
      System.out.println("Case-sensitive return value: " + match1);
      System.out.println("Case-insensitive return value: " + match2);
   }
}

Case-sensitive return value: false
Case-insensitive return value: true