Question

I’m trying to remove the filename from a path created in C# (using Server.MapPath, which by default uses \\), like :

C:\\Foo\\Bar\\Baz\\file.js

My current regex looks to be somewhat working in RegExr but in the real application it works just the opposite way :

\/[^\\]+$

What am I missing ?

Answer 1

Since you’re doing this in JS just do a String.split operation.

var path = "C:\\Foo\\Bar\\Baz\\file.js";
var separator = "\\";

function getFilenameFromPath(path, separator){
   var segmented = path.split(separator);
   return segmented[segmented.length-1];
}

console.log(getFilename(path, separator));

The RegEx way…

By the way, the only thing wrong with your original RegEx was the leading \ and the missing /

 /[^\\]+$/

Would nails it. (the trailing /g on @JDwyers answer is to make it a global match, that’s
redundant for your use case.)

So…

path.match(/[^\\]+$/); // == "file.js"

Cheers