Thank you - this is beautiful, elegant, simple and operational.

I modified it slightly to remove what I thought was unnecessary grouping - this still works: 

qr{ 
    \&?          # Leading char for Sub-name -
   ( [^(),\s]+ ) # Sub-name OR arg
    [(,)]?       # Trailing "(" or comma
 }x;

[download]
Thanks also to others who posted working solutions.

As a learning experience, I would also like to understand why the repetition attempt in my O.P - the one without the /g - did not work. Any assistance on that ?

             I hope life isn't a big joke, because I don't get it.
                   -SNL

In reply to Re^2: regex extraction for variable number of args by NetWallah
in thread regex extraction for variable number of args by NetWallah

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