JavaScript正则表达式查找以“.js”结尾而不是“-min.js”的字符串

Question

As the title states: Can any one help me figure out how to write a JavaScript regex expression that matches a string that end in ".js" but fails when given a string that ends in "-min.js".

Examples:

hello.js -> match

hellomin.js -> match

hello-min.js -> no match

hello-min-hello.js -> match

Thanks!

Answer 1

Use negative lookahead:

(?!-min)[\\w-]{4}\\.js$

Update

This will also work for less than 4 characters before the .js :

(?:(?!-min)[\\w-]{4}|^[\\w-]{1,3})\\.js$

Answer 2

使用基于前一个问题的伪反转匹配：

^((?!-min\.).)*\.js$

Answer 3

Since JS does not support negative lookbehind, lets use negative lookahead!

var str = 'asset/34534534/jquery.test-min.js',
    reversed = str.split('').reverse().join('');

// And now test it
/^sj\.(?!nim-)/.test(reversed); // will give you false if str has min.js at the end

Funny, right?

Answer 4

I have extended @robinCTS's regex to match file paths with more than one dot (for example with version number at the end of filename) and also a string that ends in ".min.js":

(?:(?!(-|\.)min)[\w\.-]{4}|^[\w\.-]{1,3})\.js$

Examples:

• hello.js -> match
• hellomin.js -> match
• hellomin-2.4.3.js -> match
• hello-min-hello.js -> match
• hello-min.js -> no match
• hello.min.js -> no match
• hellomin-2.4.3-min.js -> no match
• hellomin-2.4.3.min.js -> no match

Answer 5

You can use negative lookbehind :

(?<!-min)\.js$

Example