Yes, you answered the question correctly. Unfortunately, it was the wrong question. (That's my fault, not yours.)

I should have added: the filename can have _one or more_ digit groups separated by periods in the middle. I want to extract them ALL!

So, for example:

Should yield

0  1
1  2
2  3
3  4
4  5
5  6
6  7
7  8
8  9
[download]

I thought the g would do that, but I guess not.