I'm creating functionality to increase the last number in a filename with 1.

Samples:

```
filename01.jpg    =>  filename02.jpg
file01name01.jpg  =>  file01name02.jpg
file01na01me.jpg  =>  file01na02me.jpg

```

I'm struggling with the cases where the original file name contains the same number two or more times. I only want to increase the last number in the filename.

I have done some research, but not been able to find a correct regex. Perhaps someone could help me.

Ideally I want my code to look something like this:

```
var filename = "somefilename";

var newFilename = filename.replace(regex,lastNumber + 1);

```

I'm not sure if it could be done this easy. But I need to figure out the regex before I move on.

---

Thanks to pivmvb, here is my final solution:

```
function getIncreasedFileName(fileName){
    var newFileName = fileName.replace(/(\D+)(\d+)(\D+)$/, 
        function(str, m1, m2, m3) {
            var newstr = (+m2 + 1) + "";

            return m1 + new Array(m2.length+1 - newstr.length).join("0") + newstr + m3;
        })

    return newFileName;
}

```