isSpace is:exact

isSpace :: Char -> Bool
base Data.Char GHC.Unicode, protolude Protolude, rio RIO.Char, base-prelude BasePrelude, Cabal-syntax Distribution.Compat.Prelude, ghc-internal GHC.Internal.Unicode, rebase Rebase.Prelude, cabal-install-solver Distribution.Solver.Compat.Prelude
Returns True for any Unicode space character, and the control characters \t, \n, \r, \f, \v.
isSpace :: Char -> Bool
attoparsec Data.Attoparsec.ByteString.Char8
Fast predicate for matching ASCII space characters. Note: This predicate only gives correct answers for the ASCII encoding. For instance, it does not recognise U+00A0 (non-breaking space) as a space character, even though it is a valid ISO-8859-15 byte. For a Unicode-aware and only slightly slower predicate, use isSpace
isSpace :: Char -> Bool
word8 Data.Char8
isSpace :: Word8 -> Bool
word8 Data.Word8
isSpace :: Word16 -> Bool
os-string System.OsString.Data.ByteString.Short.Internal
isSpace :: Word8 -> Bool
mysql-haskell Data.Binary.Parser.Word8
Fast Word8 predicate for matching ASCII space characters 
isSpace w = w == 32 || w - 9 <= 4
isSpace :: IsToken c => c -> Bool
egison-pattern-src Language.Egison.Parser.Pattern
isSpace :: Char -> Bool
unicode-data Unicode.Char.General.Compat
Selects Unicode space characters (general category Space), and the control characters \t, \n, \r, \f, \v. Note: isSpace is not equivalent to isWhiteSpace. isWhiteSpace selects the same characters from isSpace plus the following:
  • U+0085 NEXT LINE (NEL)
  • U+2028 LINE SEPARATOR
  • U+2029 PARAGRAPH SEPARATOR
isSpace c == Data.Char.isSpace c
isSpace :: CharSpace char => char -> Bool
wraxml Text.XML.WraXML.Document.Tagchup