regex-applicative:具有应用接口的基于正则表达式的解析

正则表达式适用 regex-applicative是基于正则表达式的Haskell解析组合器库。 例子 import Text.Regex.Applicative data Protocol = HTTP | FTP deriving Show protocol :: RE Char Protocol protocol = HTTP <$ string " http " <|> FTP <$ string " ftp " type Host = String type Location = String data URL = URL Protocol Host Location deriving Show host :: RE Char Host host = many $ psym $ ( /= ' / ' ) url :: RE Char URL url = URL <$> proto