正则表达式匹配除“ .js”以外的所有字符

Question

I am trying to separate a module name from it's path, with javascript. The string I am receiving the regex on may or may not have ".js" on the end, but in the 2nd matching group I need to not have the ".js" if it is there. This is the regular expression so far:

([\.\/]?.+\/)?(.+[\.js]?)

for example if I have the string: ./piechart.js

Match group 1: ./

Match group 2: piechart

More test/example: https://regex101.com/r/nL9lK3/1

Answer 1

I'd suggest to filter the string first, then regex it to retrieve the module name.

function getModule (filePath) {
    var arr = filePath.split('/');
    var len = arr.length;

    var path = arr.splice(0, arr.length - 1).join('/');
    var moduleName = arr[0].match(/([a-zA-Z\-\_]+)(?=(\.js)?)/gi)[0];

    return [path, moduleName];
}

This function will return an array of path and moduleName .

Answer 2

So try this

(\\/?.+\\/)*(.+?)(\\.js)?$

and use the first two matching groups only (here's the updated regex101 ).

First group: (\\/?.+\\/)* matches all the possible paths, ending in a final slash.

Second group: (.+?) matches everything following the path, but with a lazy quantifier, allowing the third group to match if it can.

Third group: (\\.js)? matches a possible .js at the end of the string.