Javascript. I need to extract second **positive** number value in "inset" groups:

Exampple string:

> 
> "box-shadow: inset 3px 4px 0px #444, inset -1px -2px 0px #444,5px
>  6px 0px #444, inset 1px 1px 0px #444"
> 
> 
> 

so I need to extract **4 and 1** from example string.

don't get how to do this.