I have positive experiences with regex-compat, regex-posix packages, you can get these from hackage.
When your expression becomes more complicated it may be worth to use parsers instead: faster processing, refactoring parsers is also easier.

On Thu, Dec 6, 2018 at 2:45 PM David McBride <toad3k@gmail.com> wrote:
In Haskell virtually everyone uses parser combinator libraries like parsec, megaparsec, or attoparsec depending on their needs.

Many people ask this question and are then disappointed when they can't find a definitively standard regex library to use. That's because they are barely needed.

That's not to say that there are no such libraries
  There are. But I personally couldn't suggest any as I have not been compelled to use one in many years.

On Thu, Dec 6, 2018, 05:38 mike h <mike_k_houghton@yahoo.co.uk wrote:
Hi,

Which package is the most popular and/or easy to used for dealing with regular expressions?
My regex is quite simple and I just need to get 2 or 3 capture groups from the result.

Many thanks

Mike
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