How do I use predefined character classes regex?

In regex, you also have a number of predefined character classes that provide you with a shorthand notation for commonly used sets of characters. Here are the list: Predefined Class Matches . Any character d Any digit, shorthand for [0-9] D A non digit, [^0-9] s A whitespace character [^s] S Any non whitespace character […]

In regex, you also have a number of predefined character classes that provide you with a shorthand notation for commonly used sets of characters.

Here are the list:

Predefined Class	Matches
`.`	Any character
`d`	Any digit, shorthand for `[0-9]`
`D`	A non digit, `[^0-9]`
`s`	A whitespace character `[^s]`
`S`	Any non whitespace character
`w`	Word character `[a-zA-Z_0-9]`
`W`	A non word character

package org.kodejava.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PredefinedCharacterClassDemo {
    public static void main(String[] args) {
        // Define regex that will search a whitespace followed by f
        // and two any characters.
        String regex = "\\sf..";

        // Compiles the pattern and obtains the matcher object.
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(
                "The quick brown fox jumps over the lazy dog");

        // find every match and print it
        while (matcher.find()) {
            System.out.format("Text \"%s\" found at %d to %d.%n",
                    matcher.group(), matcher.start(), matcher.end());
        }
    }
}

This program output the following result:

Text " fox" found at 15 to 19.