welcome to the forum
for iterating the matches within a for each activity the typeArgument is System.Text.RegularExpressions.Match
Within the loop the retrival will done on the current looped Match Object e.g.
- yourMatchVar.Value.ToString - taking entire Capture
- yourMatchVar.Groups(1).toString - taking first Group Capture
Have a look here to get an introduction to Regex with UiPath: