Can someone please tell me how to read the following: /\.(js)$/

Question

I'm trying to understand some webserver code I found online and the part right after the "else if" is the only part I don't understand. (I just started learning this stuff). Thanks

var path = url.parse(req.url).pathname;

    // Managing the root route
    if (path == '/') {
        index = fs.readFile(__dirname+'/public/index.html',
            function(error,data) {

                //do stuff...
            });
    // Managing the route for the javascript files
    } else if( /\.(js)$/.test(path) ) {
        index = fs.readFile(__dirname+'/public'+path,
            function(error,data) {

                //do stuff...
            });

Possible duplicate of [Learning Regular Expressions](https://stackoverflow.com/questions/4736/learning-regular-expressions) — Sean Pianka, Nov 15 '18 at 20:42

score 2 · Answer 1 · answered Nov 15 '18 at 20:36

2

It allows you to test against regular expresions. Heres the MDN on how it works.

In your example, it's checking if the path ends in .js

answered Nov 15 '18 at 20:36

SpeedOfRound

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score 1 · Answer 2 · answered Nov 15 '18 at 23:11

1

Regular expressions produce non strict match against the string. Besides MSDN @SpeedOfRound mentioned about it would be useful to play with this service to get the better understanding on your exact case

answered Nov 15 '18 at 23:11

Case Tracker

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2

Can someone please tell me how to read the following: /\.(js)$/

2 Answers2