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Simple character class "[]" matches all specified characters. The following expression matches characters other than xyz.
"[xyz]"
Similarly, the following expression matches all vowels in the given input string.
"([^aeiouAEIOU0-9\\W]+)";
Then, you can use an empty string "" to replace the matched characters by using the replaceAll() method.
public class RemovingVowels { public static void main(String args[]) { String input = "Hi welcome to w3codebox"; String regex = "[aeiouAEIOU]"; String result = input.replaceAll(regex, ""); System.out.println("Result: "+result); } }Output result
Result: H welcome to the ttrlspnt
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Test { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter input string: "); String input = sc.nextLine(); String regex = "[aeiouAEIOU]"; String constants = ""; System.out.println("Input string: \n");+input); //Create a pattern object Pattern pattern = Pattern.compile(regex); //Match the compiled pattern in the string Matcher matcher = pattern.matcher(input); //Create an empty string buffer StringBuffer sb = new StringBuffer(); while (matcher.find()) { constants = constants;+matcher.group(); matcher.appendReplacement(sb, ""); } matcher.appendTail(sb); System.out.println("Result: \n");+ sb.toString();+constants ); } }Output result
Enter input string: this is a sample text Input string: this is a sample text Result: ths s smpl txtiiaaee