Illustrator Scripting :: Regex - Limit Input To A Positive Number (float Or Int)

I wish to limit the user input of and edittext to only allow a positive number, float or int. I do not yet know my Regex good enough to do this. I realize that I must get better at regex but in the meantime how to do this ?
 
I have used this so far on the edittext:
 
function checkTextInput()
{
if (this.text.match(/[^0-9.]/g))
{
this.text = this.text.replace(/[^0-9.]/g, "");
} 
}

 
Which matches
000.0001
0.45.000.1
...1
which is not desired.
 
Desired is
0.n
.n
n.n