Regexp Find Digit between two hyphens

I have a str that looks like this:

str = '7-6-1'

and I would like to return 6.

I was able to return 7 using ^[^-]*[^ -] but can't seem to find the expression to return the second item.

Answer 1

[Walter Roberson]

(?<=-)\d(?=-)

Is one of the ways.

(?-)\d(?-)

might work