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Java String Exercises: Replace each substring of a given string that matches the given regular expression with the given replacement

Java String: Exercise-25 with Solution

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.

Pictorial Presentation:

Java String Exercises: Replace each substring of a given string that matches the given regular expression with the given replacement

Sample Solution:

Java Code:

public class Exercise25 {
    
   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);
    }
}

Sample Output:

Original string: The quick brown fox jumps over the lazy dog.                                                 
New String: The quick brown cat jumps over the lazy dog.         

Flowchart:

Flowchart: Java String  Exercises - Replace each substring of a given string that matches the given regular expression with the given replacement

Visualize Java code execution (Python Tutor):


Java Code Editor:

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Java: Tips of the Day

Count the number of occurrences of a char in a String:

int count = StringUtils.countMatches("a.b.c.d", ".");

Ref: https://bit.ly/2OTy6sG