text-1.2.1.3: An efficient packed Unicode text type.

Copyright | (c) 2009, 2010 Bryan O'Sullivan
License | BSD-style
Maintainer | bos@serpentine.com
Stability | experimental
Portability | GHC
Safe Haskell | None
Language | Haskell98

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

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).