The text package

[Tags: bsd3, library]

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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Versions0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Change logNone available
Dependenciesbase (<4.4), bytestring (>=0.9 && <1.0), deepseq (>= && <1.4), extensible-exceptions, ghc-prim [details]
Copyright2008-2009 Tom Harper, 2009-2010 Bryan O'Sullivan
AuthorBryan O'Sullivan <>
MaintainerBryan O'Sullivan <> Tom Harper <> Duncan Coutts <>
CategoryData, Text
Home page
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Source repositoryhead: hg clone
head: git clone
UploadedSat Dec 4 00:42:16 UTC 2010 by BryanOSullivan
UpdatedTue Dec 30 09:44:45 UTC 2014 by HerbertValerioRiedel to revision 2
DistributionsDebian:, Fedora:, FreeBSD:, LTSHaskell:, NixOS:, Stackage:
Downloads302454 total (451 in last 30 days)
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StatusDocs uploaded by user
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For package maintainers and hackage trustees

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 bitbucket issue tracker.

Master Mercurial repository:

There's also a git mirror:

(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.