C# regular expression group names

See more:

C#

regular-expression

This is one of my regular expressions:

(?<RollP>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?),(?<RollI>[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)

The input would be 2 floats separated by a comma

2.34,-23

It creates 2 main groups "RollP" and "RollI" and i want to be able to take the GroupCollection values and put it into a dictionary like so

"RollP":"2.34"
"RollI":"-23"

But using reg.GroupNameFromNumber has me stumped. There are unnamed groups within the overall group expressions to check the floats.

How could i recurse the list or change the expression to get me to the top name which would be either RollP or RollI and still give me the associated string value?