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How to remove consonants from a string using regular expressions in Java?
The simple character class “[ ]” matches all the specified characters in it. The meta character ^ acts as negation within the above character class i.e. the following expression matches all the characters except b (including spaces and special characters)
"[^b]"
Similarly, the following expression matches all the consonants in the given input string.
"([^aeiouyAEIOUY0-9\W]+)";
Then you can remove the matched characters by replacing them with the empty string “”, using the replaceAll() method.
Example 1
public class RemovingConstants {
public static void main( String args[] ) {
String input = "Hi welc#ome to t$utori$alspoint";
String regex = "([^aeiouAEIOU0-9\W]+)";
String result = input.replaceAll(regex, "");
System.out.println("Result: "+result);
}
}Output
Result: i e#oe o $uoi$aoi
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RemovingConsonants {
public static void main( String args[] ) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input string: ");
String input = sc.nextLine();
String regex = "([^aeiouyAEIOUY0-9\W])";
String constants = "";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
//Creating an empty string buffer
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(sb, "");
}
matcher.appendTail(sb);
System.out.println("Result: \n"+ sb.toString() );
}
}Output
Enter input string: # Hello how are you welcome to Tutorialspoint # Result: # eo o ae you eoe o uoiaoi #
Updated on: 21-Nov-2019
1K+ Views
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