JavaScript丨Using regular expressions to intercept string content

1. Intercept the content in front of a string:

varstr = "aaabbbcccdddeeefff";
tr = str.match(/(\S*)fff/)[1];
alert(str);//结果aaabbbcccddd

2. Intercept the content behind a certain string:

varstr = "aaabbbcccdddeeefff";
str = str.match(/aaa(\S*)/)[1];
alert(str);//结果bbbcccdddeeefff

3. Intercept the content between two strings:

varstr = "aaabbbcccdddeeefff";
str = str.match(/aaa(\S*)fff/)[1];
alert(str);//结果bbbcccdddeee

4. Use case: intercept BV number from Bilibili video link

//普通链接
varstr = "https://www.bilibili.com/video/BV1vW411q7mj";
str = str.replace(/\//g,''); //去除链接中的斜杠
str = str.match(/vedio(\S*)/)[1]; //截取字符串"vedio"后的内容
alert(str);//结果BV1vW411q7mj

//「稍后再看」链接
varstr = "https://www.bilibili.com/list/watchlater?bvid=BV1vW411q7mj&oid=1145141919";
str = str.match(/bvid=(\S*)&oid/)[1]; //截取字符串"bvid="与"oid"之间的内容
alert(str);//结果BV1vW411q7mj

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Reference source:

JS regular intercept string - Yimei - Xiaoyi - blog garden

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