How can you use the latest Attoparsec case-insensitive match strings?

attoparsec 0.72 had this feature, but seems to have disappeared in later versions:

stringTransform :: (ByteString -> ByteString) -> ByteString -> Parser ByteString

"Match the literal string after applying the conversion to both it and the corresponding text. Useful for comparing strings case insensitive."

http://hackage.haskell.org/package/attoparsec-0.7.2/docs/Data-Attoparsec.html