Capture Text Action - RegEx pattern (match: last name, first name)

Hello-

I should start out saying that RegEx patterns is not my area of expertise.  With that said I am trying to get First Name from the following pattern

Last Name, First Name  example:  Doe, John

 I want to store "John" in result1.

 Here is the pattern I have come up with that doesn't appear to return th desired results.  

\s\w+[a-zA-Z]

 I used a tool from gskinner.com to formulate the pattern and I believe it returns what I am looking for however when I use this pattern in SPD with the Capture Text Action, it returns ' '.

Thoughts?

Scott