John Goerzen wrote:

I learned today, as I tried to run my ftphs unit tests under Hugs, that Hugs dropped Text.Regex between 200503.08 and 200609.21.

The Hugs download page claims that they did this because the new GHC implementation of Text.Regex is not compatible with Hugs.

But why can't Hugs keep the old implementation?

This is going to render Hugs just about useless for me. I like regexps.

-- John

From there you want a backend. The old backend use the local regex.h api from

I will explain how to setup Text.Regex.* for Hugs (I hope)... I have not been using Hugs, but I have created the current Text.Regex code in use by GHC. The stable regex-base package that comes with GHC 6.6 and 6.6.1 has instances (of RegexContext) that depend on GHC's late resolution of overlapping instances. Hugs can only use that with some instanes removed (via the preprocessor). The unstable regex-base package you can get with darcs is version 0.91 from http://darcs.haskell.org/packages/regex-unstable/regex-base/ has been modified to use a few newtypes to allow both GHC and Huge to use all the instances. the c library and is in the regex-posix version 0.92 package at http://darcs.haskell.org/packages/regex-unstable/regex-posix/ To get the old haskell API to this backend (Text.Regex itself) you need regex-compat version 0.90 at http://darcs.haskell.org/packages/regex-unstable/regex-compat/ To get the new pure haskell backend (works better in almost all cases) you need regex-tda at http://darcs.haskell.org/packages/regex-unstable/regex-tdfa/ Note that this regex-tdfa is the latest version, 0.93, which now has the patch that Ross Paterson sent to me and makes it Hugs compatible. So it is broken up into several smaller packages. I think all but regex-tdfa-0.93 are also available from http://hackage.haskell.org/packages/archive/pkg-list.html#cat:Text Cheers, Chris