The text package

[Tags:bsd2, library, test]

An efficient packed, immutable Unicode text type (both strict and lazy), with a powerful loop fusion optimization framework.

The Text type represents Unicode character strings, in a time and space-efficient manner. This package provides text processing capabilities that are optimized for performance critical use, both in terms of large data quantities and high speed.

The Text type provides character-encoding, type-safe case conversion via whole-string case conversion functions. It also provides a range of functions for converting Text values to and from ByteStrings, using several standard encodings.

Efficient locale-sensitive support for text IO is also supported.

These modules are intended to be imported qualified, to avoid name clashes with Prelude functions, e.g.

 import qualified Data.Text as T

To use an extended and very rich family of functions for working with Unicode text (including normalization, regular expressions, non-standard encodings, text breaking, and locales), see the text-icu package:

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Versions 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Dependencies array, base (<5), bytestring (>=0.9 && <1.0), deepseq (>= && <1.4), extensible-exceptions, ghc-prim, integer (==0.1.*), integer-gmp (>=0.2 && <0.5) [details]
License BSD3
Copyright 2009-2011 Bryan O'Sullivan, 2008-2009 Tom Harper
Author Bryan O'Sullivan <>
Maintainer Bryan O'Sullivan <>
Category Data, Text
Home page
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Source repository head: git clone
head: hg clone
Uploaded Wed Dec 21 05:32:55 UTC 2011 by BryanOSullivan
Updated Thu Dec 4 12:49:22 UTC 2014 by HerbertValerioRiedel to revision 1
Distributions Arch:, Debian:, Fedora:, FreeBSD:, LTSHaskell:, NixOS:, Stackage:, Tumbleweed:
Downloads 344824 total (18252 in the last 30 days)
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Status Docs uploaded by user
Build status unknown [no reports yet]




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Readme for text

Readme for text-

Text: Fast, packed Unicode strings, using stream fusion

This package provides the Data.Text library, a library for the space- and time-efficient manipulation of Unicode text in Haskell.

Normalization, conversion, and collation, oh my!

This library intentionally provides a simple API based on the Haskell prelude's list manipulation functions. For more complicated real-world tasks, such as Unicode normalization, conversion to and from a larger variety of encodings, and collation, use the text-icu package.

That library uses the well-respected and liberally licensed ICU library to provide these facilities.

Get involved!

Please report bugs via the github issue tracker.

Master git repository:

  • git clone git://

There's also a Mercurial mirror:

  • hg clone

(You can create and contribute changes using either Mercurial or git.)


The base code for this library was originally written by Tom Harper, based on the stream fusion framework developed by Roman Leshchinskiy, Duncan Coutts, and Don Stewart.

The core library was fleshed out, debugged, and tested by Bryan O'Sullivan, and he is the current maintainer.