import Text.Regex
date_by_ntday dateStr ntday = do
let [y,m,d] = map (\x -> read x::Int) $ splitRegex (mkRegex "-") dateStr
....
%ghc --version
The Glorious Glasgow Haskell Compilation System, version 6.12.1
Which package(s) do i need to use Text.Regex ?
Sincerely!
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fac n = foldr (*) 1 [1..n]
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