Regular Expressions in Java SE 4: Get

/**
 *
 * @author Zen Johnny
 *@date April 29, 2018 at 4:51:08 PM
 *
 */
package demo.regex;

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

public class RegexGetDemo {
	public static void getDemo(String string, String regex) {
		//step1: Encapsulate the rules into objects
		Pattern pattern = Pattern.compile(regex);
		
		//step2: Associate the regular object with the string to be extracted, and get the matching (device) engine object
		Matches matches = pattern.matcher (string);
		
		while(matcher.find()) {//Continuously use the regular engine to find objects that match the regular expression, found: true; not found: false
			System.out.println("start:" + matcher.start() + " word:" + matcher.group() + " end:" + matcher.end());
			//Return a substring currently found, and return the start() and end() of its word
		}
	}
	
	public static void main(String args[]) {
		//Extract words with more than 3 consecutive letters
		//hint: \b: word boundary; \B non-word boundary
		String string = "ming tian jiu yao fang jia la,da jia~";
		String regex = "\\b[a-zA-Z]{3,}\\b";
		getDemo(string,regex);
		/*
			ming
			tian
			jiu
			yao
			fang
			Jia
			Jia		  
		 */
	}
}