JAVA EE: How to define single backslash in Java Regex | Java Regular Expressions

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How to define single backslash in Java Regex | Java Regular Expressions | Regex in java

RegexDemo.java

import java.util.regex.Pattern;

public class RegexDemo
{
    public static void main(String[] args)
    {
        /*
         * If you want to define \d, then you must be using \\d in
         * your regex.
         */
        System.out.println(Pattern.matches("\\d*", "245")); // true
    }

}