java 正则表达式

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测试代码:

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

public class Main {

    public static void main(String[] args) {

        String str="bbg";
        Pattern pattern = Pattern.compile("(b*g)");
        Matcher matcher = pattern.matcher(str);
        System.out.println(matcher.matches());
        System.out.println(pattern.matches("b*g","bbg"));
        System.out.println(pattern.matches("[0-9]{6}", "200038"));
        System.out.println(pattern.matches("//d{6}", "200038"));
        //验证电话号码
        System.out.println(pattern.matches("[0-9]{3,4}//-?[0-9]+", "021-78989799"));
        getString("D:/dir1/test.txt");
        getChinese("welcome to china,江西奉新,welcome,你!");
    }
    public static void getString(String str){
        String regex = ".+/(.+)$";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        if(!matcher.find()){
            System.out.println("文件路径格式不正确！");
            return;
        }
        System.out.println(matcher.group(1));
    }
    public static void getChinese(String str){
        String regex = "[//u4E00-//u9FFF]+";//[//u4E00-//u9FFF]为汉字
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()){
            sb.append(matcher.group());
        }
        System.out.println(sb);
    }
    public static void validateEmail(String email){
        String regex = "[0-9a-zA-Z]+@[0-9a-zA-Z]+//.[0-9a-zA-Z]+";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(email);
        if(matcher.matches()){
            System.out.println("这是合法的Email");
        }else{
            System.out.println("这是非法的Email");
        }
    }

}

java 正则表达式

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原文地址：http://www.cnblogs.com/zhengfengshaw/p/4537055.html