Copyright	(c) 2009 2010 Bryan O'Sullivan
License	BSD-style
Maintainer	bos@serpentine.com
Stability	experimental
Portability	GHC
Safe Haskell	Safe-Inferred
Language	Haskell2010

Data.Text.Internal.Lazy.Search

Description

Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!

Fast substring search for lazy Text, based on work by Boyer, Moore, Horspool, Sunday, and Lundh. Adapted from the strict implementation.

Synopsis

indices :: Text -> Text -> [Int64]

Documentation

indices Source #

Arguments

:: Text	Substring to search for (`needle`)
-> Text	Text to search in (`haystack`)
-> [Int64]

O(n+m) Find the offsets of all non-overlapping indices of needle within haystack.

This function is strict in needle, and lazy (as far as possible) in the chunks of haystack.

In (unlikely) bad cases, this algorithm's complexity degrades towards O(n*m).