正则小练习

1、字符串替换
需求：有字符串“Once1a2wolf,3always4a5wolf!”，
写代码实现最终输出结果“Once a wolf, always a wolf!”

<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">
        var s = "Once1a2wolf,3always4a5wolf!";
        var regex = /\d+/g;
        var s2 = s.replace(regex, " ");
        alert(s2);

        </script>

2、字符串切割
需求：请按照叠词切割“sdqqfgkkkhjppppkl”

<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">
        s = 'sdqqfgkkkhjppppkl';
        regex = /(.)\1+/;
        var arr = s.split(regex);
        // console.log(arr);
        s = 'sdqqfgkkkhjppppkl';
        regex = /(.)\1+/g;
        var s2 = s.replace(regex, " ");
        var arr = s2.split(' ');
        alert(arr);
</script>

3、字符串替换
需求：将字符串“我我....我...我.要...要要...要学....学学..学.编..编编.编.程.程.程..程”还原成“我要学编程”

<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">
        var s = "我我....我...我.要...要要...要学....学学..学.编..编编.编.程.程.程..程";
        var regex = /\.+/g;
        var s2 = s.replace(regex, "").match(/(.)\1+/g);
        var s3=''
        for(i in s2){
            s3+=s2[i][0]
        }

        alert(s3);

        </script>

4、字符串获取
需求：把一个字符串"我的手机号码是17688888888，曾经用过13187654321，还用过13512345678"中的手机号码获取出来

<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">
        // regex = /^1[567]\d{8}$/;
        var s = '我的手机号码是17688888888，曾经用过13187654321，还用过13512345678';
        var regex = /1[567]\d{9}/g;
        var arr = s.match(regex);
        alert(arr);//["17688888888","13187654321","13512345678"]

    </script>