Pattern和Matcher中正宗正则表达式

package day_15;

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

public class Group {
	public static final String POEM="Twas brillig,and the slity toaves\n"+
									"Did gyre and gimble in the wabe.\n"+
									"All mimsy were the borogoves.\n"+
									"And the mome raths outgrabe.\n\n";
	/**第一层group表示输出最后三个单词
	 * @param args
	 * 表示结尾的标志;?m表示开头的 标志
	 * m.groupCount()组数不包括最外层 的即group(0)是不被计数的;
	 */
	public static void main(String[] args) {
		/*String s="123546378645";
		System.out.println(s.replaceAll("1\\d{10}", s));*/
		Matcher m=Pattern.compile("(?m)(\\S+)\\s+((\\S+)\\s+(\\S+))$").matcher(POEM);
		while(m.find()){
			for (int i = 0; i <=m.groupCount(); i++) {
				System.out.print("["+m.group(i)+"]");
				System.out.println(m.start(i));
				System.out.println(m.end(i));
			System.out.println();	
				
			}
			
		}
	}
}