Get directory of a file name in Javascript

Question

How to get the directory of a file?

For example, I pass in a string

C:\\Program Files\\nant\\bin\\nant.exe

I want a function that r

Answer 1

Use:

var dirname = filename.match(/(.*)[\/\\]/)[1]||'';

*The answers that are based on lastIndexOf('/') or lastIndexOf('\') are error prone, because path can be "c:\aa/bb\cc/dd".
(Matthew Flaschen did took this into account, so my answer is a regex alternative)