正则表达式

来源：互联网发布：足球战术设计软件编辑：程序博客网时间：2024/05/03 13:24

关于正则表达式的语法： http://blog.csdn.net/qq_34838643/article/details/58603851

import java.util.regex.Matcher;import java.util.regex.Pattern;public class Regex {    public static void main(String[] args) {        //matchDemo();          //splitDemo();        //replaceDemo();        getDemo();    }    // 1..匹配    public static void matchDemo(){        String mail = "nc970728@gmail.com";        String regex = "[0-9a-zA-Z]{3,8}@gmail.com";        System.out.println(mail.matches(regex));    }    // 2..切割    public static void splitDemo(){        String str = "faffhgrrrtj";        String regex = "(.)\\1+"; //根据叠词切割        String[] arr = str.split(regex);        for (String sub : arr) {            System.out.println(sub);        }    }    // 3..替换    public static void replaceDemo(){        String str = "faffhgrrrtj";        String regex = "(.)\\1+";         System.out.println(str.replaceAll(regex,"$1")); //fafhgrtj    }    // 4..获取    public static void getDemo(){        String mail = "faffhgrrrtj";        String regex = "(.)\\1+";         //将规则封装成对象        Pattern p = Pattern.compile(regex);        //将正则对象和要作用的字符串相关联，获取匹配器对象        Matcher m = p.matcher(mail);        while(m.find())        {            System.out.println(m.group());            System.out.println(m.start()+"---"+m.end());        }        //System.out.println(m.matches());     }}

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