Regular expression to remove a file's extension

Question

I am in need of a regular expression that can remove the extension of a filename, returning only the name of the file.

Here are some examples of inputs and outputs:<

Answer 1

The regular expression to match the pattern is:

/\.[^.]*$/

It finds a period character (\.), followed by 0 or more characters that are not periods ([^.]*), followed by the end of the string ($).

console.log( 
  "aaa.bbb.ccc".replace(/\.[^.]*$/,'')
)

Answer 2

Just for completeness: How could this be achieved without Regular Expressions?

var input = 'myfile.png';
var output = input.substr(0, input.lastIndexOf('.')) || input;

The || input takes care of the case, where lastIndexOf() provides a -1. You see, it's still a one-liner.

Answer 3

This will do it as well :)

'myfile.png.jpg'.split('.').reverse().slice(1).reverse().join('.');

I'd stick to the regexp though... =P