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Posix character classes p{Space} Java regex.
This class matches white space characters. i.e. \t, \n, \x, 0B, \f, \r.
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class SpaceCharacters {
public static void main(String args[]) {
//Reading String from user
System.out.println("Enter a string");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
//Regular expression
String regex = "[\p{Space}]";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("Number of space characters: "+count);
}
}Output
Enter a string space tab test Number of space characters: 2
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main( String args[] ) {
//Regular expression to match lower case letters
String regex = "^.*\p{Space}.*$";
//Getting the input data
Scanner sc = new Scanner(System.in);
System.out.println("Enter 5 input strings: ");
String input[] = new String[5];
for (int i=0; i<5; i++) {
input[i] = sc.nextLine();
}
//Creating a Pattern object
Pattern p = Pattern.compile(regex);
System.out.println("Strings with spaces: ");
for(int i=0; i<5;i++) {
//Creating a Matcher object
Matcher m = p.matcher(input[i]);
if(m.matches()) {
System.out.println(m.group());
}
}
}
}Output
Enter 5 input strings: sample data hello welcome to tutorialspoint 12345 ab bc cd da Strings with spaces: sample data welcome to tutorialspoint ab bc cd da
Updated on: 09-Jan-2020
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