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javascriptfile-extension

How can I get file extensions with JavaScript?

See code: 

var file1 = "50.xsl";
var file2 = "30.doc";
getFileExtension(file1); //returns xsl
getFileExtension(file2); //returns doc

function getFileExtension(filename) {
    /*TODO*/
}
Solution

  • Newer Edit: Lots of things have changed since this question was initially posted - there's a lot of really good information in wallacer's revised answer as well as VisioN's excellent breakdown

    Edit: Just because this is the accepted answer; wallacer's answer is indeed much better:

    return filename.split('.').pop();

    My old answer:

    return /[^.]+$/.exec(filename);

    Should do it.

    Edit: In response to PhiLho's comment, use something like:

    return (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;