Matched route returns wrong value for capture group

I have a regex route containing the capture group `(.+)` (matching everything).
This works as expected most of the time and I can access the matched group in the third argument of bind´s callback function. However, numeric values are somehow modified. `01` becomes `1`… alright. But: `053` becomes `43`. And `0123` becomes `83`.

My Code is:

``` javascript
router.get(/^search\/(.+)?$/).bind(function(req, res, val){
console.log("req.url.path: "+req.url.path)
console.log("captured: "+val);
});
```

And the output is:

```
req.url.path: /search/0123
captured: 83
```

It's not a Javascript issue, if I match the path using the regex.exec function, the capture group is correct.