Hello. How mkRegex and matchRegex can be used with the regex-tdfa backend in ghci? The following fails: $ ghci GHCi, version 6.10.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Prelude> import Text.Regex Prelude Text.Regex> import Text.Regex.TDFA Prelude Text.Regex Text.Regex.TDFA> let re = mkRegex "jos. romildo" Loading package syb ... linking ... done. Loading package array-0.2.0.0 ... linking ... done. Loading package containers-0.2.0.1 ... linking ... done. Loading package bytestring-0.9.1.4 ... linking ... done. Loading package mtl-1.1.0.2 ... linking ... done. Loading package regex-base-0.93.1 ... linking ... done. Loading package regex-posix-0.94.1 ... linking ... done. Loading package regex-compat-0.92 ... linking ... done. Prelude Text.Regex Text.Regex.TDFA> let text = "josé romildo" Prelude Text.Regex Text.Regex.TDFA> matchRegex re text Nothing Clearly regex-posix is being used here. The standalone version of the program works as expected: $ cat t.hs module Main (main) where import Text.Regex import Text.Regex.TDFA re = mkRegex "jos. romildo" text = "josé romildo" result = matchRegex re text main = print result $ ghc --make t [1 of 1] Compiling Main ( t.hs, t.o ) Linking t ... $ ./t Just [] Any clues? Romildo