正则表达式高级用法之分组的使用教程

var str = "abcd324232efg";
var reg = new RegExp("([a-z]*)(\\d*)([a-z]*)");
var arr = str.match(reg);
// 显示匹配到的分组内容
alert(arr[0] + "===" + arr[1] + "===" + arr[2] + "===" + arr[3]);
alert(RegExp.$1 + "-----" + RegExp.$2 + "----" + RegExp.$3);  

public static void main(String[] args) {
    String str = "abcd324232efg";
    Pattern pattern = Pattern.compile("([a-z]*)(\\d*)([a-z]*)");
    Matcher matcher = pattern.matcher(str);
    if (matcher.find()) {
        System.out.println(matcher.group());
        System.out.println(matcher.group(0));
        System.out.println(matcher.group(1));
        System.out.println(matcher.group(2));
        System.out.println(matcher.group(3));
    }
}

import java.util.Arrays;
public class RegexApply {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
//		demo1();
//		demo2();
//		demo3();
//		demo4();
//		demo5();
//		demo6();
	}
	private static void demo6() {
		
		String s = "我..我我...我....爱..爱爱爱....爱爱..学.学学..学学学...学习习..习...习.习.习......习习习习";
		String s2 = s.replaceAll("\\.+", "");
		String s3 = s2.replaceAll("(.)\\1+", "$1");	
		System.out.println(s3);
	}
	private static void demo5() {
		
		String s = "acyyfgttthjzzzzzko";
		String regex = "(.)\\1+";					//1+代表第一组出现一次到多次
		String[] arr = s.split(regex);
		
		for (int i = 0; i < arr.length; i++) {
			System.out.println(arr[i]);
		}
	}
	private static void demo4() {
		
		//叠词  飘飘亮亮,美美丽丽
		String regex2 = "(.)\\1(.)\\2";					//\\1代表第一组又出现一次	\\2代表第二组又出现一次
		System.out.println("漂漂亮亮".matches(regex2));	//true
		System.out.println("美美丽丽".matches(regex2));	//false
		System.out.println("高高兴兴".matches(regex2));	//true
		System.out.println("死啦死啦".matches(regex2));	//false
		System.out.println("----------------------");
		//叠词 漂亮漂亮,美丽美丽
		String regex = "(..)\\1";
		System.out.println("死啦死啦".matches(regex));		//true			
		System.out.println("高兴高兴".matches(regex));		//true
		System.out.println("快快乐乐".matches(regex));		//false
	}
	private static void demo3() {
		
		String s = "aaoo1DDD3jgjao";
		String regex = "\\d";
		String s2 = s.replaceFirst(regex, "");
		String s3 = s.replaceAll(regex, "");
		System.out.println(s2);					//aaooddd3jgjao
		System.out.println(s3);					//aaoodddjgjao
	}
	private static void demo2() {
		
		String s = "星期一.星期二.星期三.星期四";
		String[] array = s.split("\\.");
		System.out.println(Arrays.toString(array));
	}
	private static void demo1() {
		
		String regex = "[1-9]\\d{5,15}";
		System.out.println("804360385".matches(regex));				//true
		System.out.println("430763075439703307503".matches(regex));	//false
		System.out.println("03534534".matches(regex));				//false
	}
}