Java programming Exercises: Remove the specific letters from a string and return the new string

Java Regular Expression: Exercise-19 with Solution

Write a Java program to remove the specific letters from a string and return the new string. Specific letters: "p", "q", or "r".

If the given string does not contain "p", "q", or "r", return “Not found.”

Sample Solution-1:

Java Code:

public class test {
 
   public static void main(String[] args) {	   
	    String text ="The quick brown fox jumps over the lazy dog.";
		System.out.println("Original Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
		text ="Java Exercises.";
		System.out.println("\nOriginal Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
		text ="Java linkedlist.";
		System.out.println("\nOriginal Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
	    
        }

   public static String validate(String text) {
	     	String s = text.replaceAll("(?i)[pqr]", "");
    return text.equals(s) ? "Not found." : s;
   }
}

Sample Output:

Original Text: The quick brown fox jumps over the lazy dog.
Remove p,q,r characters from the said string(if present): The uick bown fox jums ove the lazy dog.

Original Text: Java Exercises.
Remove p,q,r characters from the said string(if present): Java Execises.

Original Text: Java linkedlist.
Remove p,q,r characters from the said string(if present): Not found.

Pictorial Presentation:

Flowchart :

Sample Solution-2:

Java Code:

public class test {
 
   public static void main(String[] args) {	   
	    String text ="The quick brown fox jumps over the lazy dog.";
		System.out.println("Original Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
		text ="Java Exercises.";
		System.out.println("\nOriginal Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
		text ="Java linkedlist.";
		System.out.println("\nOriginal Text: "+text);
		System.out.println("Remove p,q,r characters from the said string(if present): "+validate(text));
	    
        }

   public static String validate(String text) {
	   return text.matches(".*[pqrPQR].*") ? text.replaceAll("[pqrPQR]","") : "Not found.";
   }
}

Sample Output:

Original Text: The quick brown fox jumps over the lazy dog.
Remove p,q,r characters from the said string(if present): The uick bown fox jums ove the lazy dog.

Original Text: Java Exercises.
Remove p,q,r characters from the said string(if present): Java Execises.

Original Text: Java linkedlist.
Remove p,q,r characters from the said string(if present): Not found.

Flowchart :

Java Code Editor:

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