MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

/*
Group 0: 1
Group 1: 1
Group 2: null
Group 3: null
Group 0: 2
Group 1: 2
Group 2: null
Group 3: null
Group 0: 3
Group 1: 3
Group 2: null
Group 3: null
Group 0: 4.5
Group 1: 4.5
Group 2: .5
Group 3: null
 */
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainClass {

    public static void main(String[] av) {
        String regEx = "[+|-]?(\\d+(\\.\\d*)?)|(\\.\\d+)";
        String str = "a b c d e 1 2 3 4.5 ";
        Pattern pattern = Pattern.compile(regEx);
        Matcher m = pattern.matcher(str);
        while (m.find()) {
            for (int i = 0; i <= m.groupCount(); i++) {
                System.out.println("Group " + i + ": " + m.group(i)); // Group i substring
            }
        }
    }

}