haskell regex-tdfa with groups

$ cabal install regex-tdfa

$ ghci

Prelude> :mod +Text.Regex.TDFA

Prelude Text.Regex.TDFA> "DIN A4 (210 x 297 mm)" =~ "([0-9]+) x ([0-9]+)" :: [[String]]
[["210 x 297","210","297"]]