I have a string such as

fileName<-"Agg.20.20.20-all-01".

All I want to do is pull the "20.20.20" and the "all" as strings.

Obviously, they aren't always those values.

The "20.20.20" can be "30.30.30" but it's always after the . which is next to the second g in Agg and it's always the same length. The all might not always be "all" but in general it is the text between the two dashes.

I made an attempt using below but perl expressions and myself are an extremely bad match ( pun was intended ) and all I got back was the same string as
fileName in both cases.

 weights=sub("^Agg.(\\.*)-\\.*$", "\1",fileName)
 dashesstring=sub("^Agg.\\.*-(\\.*)-\\.*$", "\1",fileName)

I could possibly using strsplit but I'm trying to learn perl expressions as best I can so a solution using that approach is really appreciated. Thanks.

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