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Program to match vowels in a string using regular expression in Java
You can group all the required characters to match within the square braces “[ ]” i.e. The metacharacter/sub-expression “[ ]” matches all the specified characters. Therefore, to match all the letters specify the vowel letters within these as shown below −
[aeiouAEIOU]
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchVowels {
public static void main( String args[] ) {
String regex = "[aeiouAEIOU]";
System.out.println("Enter input string: ");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
//Compiling the regular expression
Pattern.compile(regex);
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("The input string contains vowels");
} else {
System.out.println("The input string does not contain vowels");
}
}
}Output
Enter input string: hello how are you welcome The input string contains vowels
Example 2
import java.util.Scanner;
public class Test {
public static void main( String args[] ) {
String regex = "[aeiouAEIOU]";
System.out.println("Enter input string: ");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
boolean result = input.matches(regex);
if(result) {
System.out.println("The input string contains vowels");
} else {
System.out.println("The input string does not contain vowels");
}
}
}Output
Enter input string: hello how are you welcome The input string does not contain vowels
Updated on: 21-Nov-2019
3K+ Views
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