[Haskell-cafe] Separate a string into a list of strings

[Clifford Beshers]

Sara Kenedy wrote:
> Hi all,
>
> I want to write a function to separate a string into a list of strings
> separated by commas.
>
> Example:
> separate :: String -> [String]
>
> separate "Haskell, Haskell, and Haskell" = ["Haskell", "Haskell", "and 
> Haskell"]
>
> If anyone has some ideas, please share with me. Thanks.
Here is a solution using the Posix regex module.

    Prelude Text.Regex> splitRegex (mkRegex "[ \t]*,[ \t]*") "Haskell,
    Haskell, and Haskell"
    ["Haskell","Haskell","and Haskell"]

This form should work regardless of locale, but appears to be broken, 
although I expect this is either my fault or that of the underlying 
Posix library:

    Prelude Text.Regex> splitRegex (mkRegex "[:space:]*,[:space:]*")
    "Haskell, Haskell, and Haskell"
    ["Haskell"," Haskell"," and Haskell"]


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