javascript - A small question about regular expressions, please solve it-PHP Chinese Network Q&A

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javascript - A small question about regular expressions, please solve it

世界只因有你 2017-06-26 10:54:22

626

Now I have a requirement, for example, let a = 'asdadaasd.jpg'||'Chinese.png';
2. Now I need to intercept .jpg||.png|| .gif||.jpeg The first 8 digits are '...'.png

let a = 'asdasdqweqweqwadsdasd.png'; let reg = /正则/; let strSub =>(filename){ xxx return filename } // 输出的 filename 为 asdasdqweq....png;

世界只因有你

reply all (1)

我想大声告诉你2017-06-26 10:56:22 1 floor

Practice your hands, it is not recommended to use regular rules

Regular method---code

let testStr='asdasdqweqweqwadsdasd.png'; let reg=/(\w{8})\S+([.](?:png|jpeg|gif|jpg))/; let newStr=testStr.replace(reg,function(match,p1,p2,offset,string){ return p1+p2; }); console.log(newStr)

This is the best way to actually intercept strings code:

let testStr='asdasdqweqweqwadsdasd.png'; let index=testStr.lastIndexOf("."); let newStr=testStr.substr(0,8)+testStr.substr(index,testStr.length-index); console.log(newStr)