Write a Java program to replace each substring of a given string that matches the given regular expression with the given replacement.
Sample string : "The quick brown fox jumps over the lazy dog."
In the above string replace all the fox with cat.

Java Programming Language String in java (Article) String in java (Program)

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Program:

public class Exercise {

   public static void main(String[] args)
    {
        String str = "The quick brown fox jumps over the lazy dog.";

         // Replace all the 'dog' with 'cat'.
        String new_str = str.replaceAll("fox", "cat");

         // Display the strings for comparison.
        System.out.println("Original string: " + str);
        System.out.println("New String: " + new_str);
    }
}

Output:

Original string: The quick brown fox jumps over the lazy dog.
New String: The quick brown cat jumps over the lazy dog.
Press any key to continue . . .

Explanation:

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