[Haskell-cafe] Re: user error when using Text.Regex.PCRE
haskell at list.mightyreason.com
Tue Nov 20 09:36:43 EST 2007
Thank you very much for the error report. I have tracked down the cause.
You are searching against an empty Bytestring. This is now represented by
> -- | /O(1)/ The empty 'ByteString'
> empty :: ByteString
> empty = PS nullForeignPtr 0 0
And while the useAsCString and useAsCStringLen functions never reveal the null
pointer, the current library uses unsafeUseAsCStringLen, which returns the null
And this is getting caught by a null pointer check resulting in your crash. I
will post a fix later tonight, and announce it.
Which regex-prce version are you using? Perhaps from hackage? I want to
prioritize the version you need fixed.
The earlier repository holds up to version 0.81 at
The newer repository holds up to version 0.92 at
Out of further curiosity:
Which version of the pcre library does it use?
And what version of ghc?
Which version of Data.ByteString?
More information about the Haskell-Cafe