.regionMatches()

The .regionMatches() method tests if two string regions are equal. It compares a substring in the given String to another substring in the argument passed.

string.regionMatches(ignoreCase, toffset, other, ooffset, len);

Where:

• ignoreCase is a boolean value that specifies whether the method should be case-sensitive or not.
• toffset is an integer representing the index of the substring in the first string to be compared.
• other is the string argument to be compared.
• ooffset is an integer representing the index of the substring in the second string to be compared.
• len is an integer representing the number of characters to be compared in both strings.

Note: For the method to be case-sensitive, ignoreCase can also be omitted.

The example below compares a substring in variables S1 and S2:

// Example.java
public class Example{

  public static void main(String[] args){

    String S1 = new String("This is an example");
    String S2 = new String("is");
    System.out.print("Result of comparing S1 with S2: ");
    System.out.println(S1.regionMatches(true, 5, S2, 0, 2));

  }

}

This outputs the following:

Result of comparing S1 with S2: true