It provides regular and monadic versions, a very overloaded and useful interface, as well as extensibility. although currently the only instance is based on Text.Regex, it generalizes to matching lists of arbitrary type, not just strings, and also leaves the door open for compile-time checked and optimized regular expressions via template Haskell.
I have a concern here that I hope you won't see as a negative response to your ideas...
I recently ran into some problems porting some Haskell code to Windows because it used the Text.Regex library, which is dependent on a Unix-only system. If Haskell is to embrace the use of Regexes to a level comparable with (say) Perl, I think it is important that the underlying library is available on all platforms on which Haskell is supported, or I fear that a large swathe of Haskell support libraries will be unavailable to programs running on Windows.
So my point would be that, to be most useful to the Haskell community, your effort should also be supported by a Text.Regex implementation (or alternative) for Windows systems.
#g
------------ Graham Klyne For email: http://www.ninebynine.org/#Contact
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