@hackage re20.1

re2 is a regular expression library offering predictable run-time and memory consumption. This package is a binding to re2.

Supported expression syntax is documented at http://code.google.com/p/re2/wiki/Syntax.

$ ghci -XOverloadedStrings
ghci> import Regex.RE2

ghci> find "\\w+" "hello world"
Just (Match [Just "hello"])

ghci> find "\\w+$" "hello world"
Just (Match [Just "world"])

ghci> find "^\\w+$" "hello world"
Nothing