[Haskell-cafe] Haskell performance when it comes to regex?

Станислав Черничкин schernichkin at gmail.com
Fri May 19 11:17:28 UTC 2017

Try to use Text or ByteString instead of strings. Try to use compile and
execute methods (
make sure regex get compiled once.

2017-05-16 12:12 GMT+03:00 Bram Neijt <bneijt at gmail.com>:

> Dear reader,
> I decided to do a little project which is a simple search and replace
> program for large text files.
> Written in Haskell, it does a few different regex matches on each line
> and stores them in a leveldb key-value store to create a
> consistent/reviewable search-replace index. It should provide for some
> simple/brute-force anonymization of data and therefore I called it
> hanon (sorry, could not think of a better name).
> https://github.com/BigDataRepublic/hanon
> The code works, but I've done some benchmarking to compare it with
> Python and the code is about 80x slower then doing the same thing in
> Python, making it useless for larger data files.
> I'm obviously doing something wrong.
> Could you give me tips on improving the performance of this code?
> Probably mainly looking at
> https://github.com/BigDataRepublic/hanon/blob/master/src/Mapper.hs
> where the regex code lives?
> Greetings,
> Bram
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Sincerely, Stanislav Chernichkin.
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