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Java programming Exercises: Count number of vowels in a given string using regular expression

Java Regular Expression: Exercise-14 with Solution

The word vowel comes from the Latin word vocal is, meaning "vocal" (i.e. relating to the voice). In English, the word vowel is commonly used to refer both to vowel sounds and to the written symbols that represent them (a, e, o, u, y), and sometimes I

Write a Java program to count number of vowels in a given string using regular expression.

Here we consider a, e, i, o, u are vowels (not y).

Sample Solution:

Java Code:

public class test { 
   public static void main(String[] args) {	   
	    String text = "C++";
		System.out.println("Original string: "+text);
		System.out.println("New string: "+validate(text));
		text = "Java";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
		text = "MID-CENTRALIZED";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
		text = "LOWERED";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
        }

   public static int validate(String text) {
	   return text.replaceAll("[^aeiouAEIOU]", "").length();
   }
}

Sample Output:

Original string: C++
New string: 0

Original string: Java
New string: 2

Original string: MID-CENTRALIZED
New string: 5

Original string: LOWERED
New string: 3

Pictorial Presentation:

Java Regular Expression: Count number of vowels in a given string using regular expression.

Flowchart :

Flowchart: Count number of vowels in a given string using regular expression.

Java Code Editor:

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Java: Tips of the Day

Split Java String by New Line

String lines[] = string.split("\\r?\\n");

There's only really two newlines (UNIX and Windows) that you need to worry about.

Ref: https://bit.ly/3dHk7ip