What regular expression can I use to find the Nᵗʰ entry in a comma-separated list?

Question

I need a regular expression that can be used to find the N^th entry in a comma-separated list.

For example, say this list looks like this:

Answer 1

You could use something like:

([^,]*,){$m}([^,]*),

As a starting point. (Replace $m with the value of (n-1).) The content would be in capture group 2. This doesn't handle things like lists of size n, but that's just a matter of making the appropriate modifications for your situation.