[Haskell-cafe] ANN: TextRegexLazy-0.56, (=~) and (=~~) are here

Chris Kuklewicz haskell at list.mightyreason.com
Wed Aug 2 11:12:55 EDT 2006

Bulat Ziganshin wrote:
> Hello Chris,
> Wednesday, August 2, 2006, 3:16:58 PM, you wrote:
>> Announcing: TextRegexLazy version 0.56
> your feature list is really strong! it will be great now to make it
> a part of GHC standard distribution
> afaiu, selection of regex engine implemented via import statements?

Well, yes.  The "makeRegex" is provided by each of the 4 backends to create its 
own Regex type. So there are 4 different data types:


I might be able to make a "framework" polymorphic type:

data Regex backend = ....


> as long-standing goals i can point to support of lazy bytestrings,

Lazy bytestrings are very specialized.  You could probable "unpack" them and 
send them to the Full or DFA backends.

> UTF-8,

The Posix backend will never understand unicode of any type.  The PCRE backend, 
if compiled properly, does understand UTF8.  You need an encoder/decoder between 
Unicode [Char] to UTF8 CStringLen or ByteString.  The Full and DFA backends 
understand Char and are therefore already Unicode compliant.

> filename wildcards.

What is a FilePath?  Ooops...wrong thread!

> but that is really more the details than
> essentials and now testing/bundling with GHC is most important
> (of course, imho)

More testing is a must.  But the 352 ways to operate it make this annoying.

More documentation is just grunt work.

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