第九章正则表达式

创建对象
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //1.方式1：使用字面量方式创建对象
        var reg = /xinlang/;
        var str = 'fsafafasfxinlangfafafa';
        //检验字符是否匹配正则表达式,用test()
        var boo = reg.test(str);
        console.log(boo);
        //2.方式2：使用构造函数方式创建对象
        var reg2=new RegExp('zhangsan');
        var str='dasfasgfasfzhangsanfafa';
        var boo2=reg2.test(str);
        console.log(boo2);
        //3.正则表达式参数g-全局匹配，i-忽略大小写，m-多行匹配
        var reg3 = /zhanGsan/gi;
        // var reg3 = new RegExp('zhangsan','g');
        var str3 = '11111111zhangsan2132314141zhangsan';
        var newStr3 = str3.replace(reg3, '张三');
        console.log(newStr3);
    </script>
</body>
</html>
第九章 正则表达式
