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On May 29, 2007, at 10:57, Philippe Lhoste wrote:

PA, I am not sure my code can have any utility for you (it is mostly to check whole words, although one can end before reaching the end) but it was an opportunity to show it. ;-)

I'm always curious about, ahem, curiosities... so bring it on :)

To keep you company, here is a rather wacky pseudo implementation which uses the file system to persist its data structure...

Usage example:

local aTrie = Trie( 'trie' )

local aString = [[
It’s easy to find, in the mightily expanding iconography of American waste, the monumental (a ziggurat of flattened cars), the sinister (ocher sludge foaming on a riverbank) and the sublime (a plastic bag fluttering in a Japanese maple). The empty bottle and crushed aluminum can are none of these. They are almost too commonplace to notice, too dreary to evoke anything at all. Foundered on a roadside or slumped in a bag of spent Chinese takeout, the can without its Mountain Dew and the bottle without its Bud are unremarkable things. They’re just trash: something we once wanted and now can’t be bothered with.

for aWord in aString:gmatch( '([%S]+)' ) do
    aWord = aWord:gsub( '%p', '' )
    aTrie[ aWord ] = aWord

for anIndex, aValue in ipairs( aTrie[ 'a' ] ) do
    print( anIndex, aValue )

> 1       a
> 2       at
> 3       are
> 4       anything
> 5       and
> 6       American
> 7       aluminum
> 8       almost
> 9       all

Attachment: Trie.lua
Description: Binary data