正则表达式

java 代码

import java.util.regex.Matcher;
import java.util.regex.Pattern;
//matches是匹配整个字符串；find是从头开始一个一个往后找；lookAt是一直从头开始找，不断地重复；
public class TestMail {
    public static void main(String[] args) {
        Pattern p = Pattern.compile("\\b.+");
        String s = "asf_sdfs_sdfsf_sdfsff";
        Matcher m = p.matcher(s);
        System.out.println(m.matches());
        System.out.println(m.find());
        System.out.println(m.find());
        System.out.println(m.find());
        System.out.println(m.find());
        System.out.println(m.lookingAt());//true
    }
}