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copied!<p>You could install the web-encodings package, take the Sourcecode of the decodeHtml function and add the characters you need (works for me). This is all you need:</p> <pre><code>import Data.Maybe import qualified Web.Encodings.StringLike as SL import Web.Encodings.StringLike (StringLike) import Data.Char (ord) -- | Decode HTML-encoded content into plain content. -- -- Note: this does not support all HTML entities available. It also swallows -- all failures. decodeHtml :: StringLike s => s -> s decodeHtml s = case SL.uncons s of Nothing -> SL.empty Just ('&', xs) -> fromMaybe ('&' `SL.cons` decodeHtml xs) $ do (before, after) <- SL.breakCharMaybe ';' xs c <- case SL.unpack before of -- this are small enough that unpack is ok "lt" -> return '<' "gt" -> return '>' "amp" -> return '&' "quot" -> return '"' '#' : 'x' : hex -> readHexChar hex '#' : 'X' : hex -> readHexChar hex '#' : dec -> readDecChar dec _ -> Nothing -- just to shut up a warning return $ c `SL.cons` decodeHtml after Just (x, xs) -> x `SL.cons` decodeHtml xs readHexChar :: String -> Maybe Char readHexChar s = helper 0 s where helper i "" = return $ toEnum i helper i (c:cs) = do c' <- hexVal c helper (i * 16 + c') cs hexVal :: Char -> Maybe Int hexVal c | '0' <= c && c <= '9' = Just $ ord c - ord '0' | 'A' <= c && c <= 'F' = Just $ ord c - ord 'A' + 10 | 'a' <= c && c <= 'f' = Just $ ord c - ord 'a' + 10 | otherwise = Nothing readDecChar :: String -> Maybe Char readDecChar s = do case reads s of (i, _):_ -> Just $ toEnum (i :: Int) _ -> Nothing </code></pre> <p>I did not test performance though. But it might be a nice sample if you this can be done without regexps as well.</p>

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