Substitue text with links

[eporue]

Hi, Im trying to create a script that converts a plain text into a set of links: i.e. enter a phrase, and everyword in that phrase of more than 5 letters gets converted into a link to amazon with a keyword search for that term.

That way, with a long text, I can create thousands of links automatically and hopefully increase the return on my affiliate accounts.

So far, I have done this,, but it doesn't work even close to what I need:

<?php

//Affiliate link code
$epo_affiliate_link='http://www.loslibros.com/principal.cgi?afiliado=ar25179&keywords=' ;
$epo_jump_nr=5 ;		//how many words to create a new link
$epo_min_word_lenght=5 ;	//minimum length of a word to create a link for it


$story = "This is a sentence to convert into links, joder";


$story= eregi_replace(".[:space:]","<a href=\"http://www.loslibros.com/principal.cgi?afiliado=ar25179&keywords=\\0\">\\0</a>", $story);

echo $story . "<br>";


?>

Any suggestion ??

Thank you.

Eduardo

http://playlingerie.com

[Weedpacket]

preg_replace('/\b[a-z]{5,}\b/i', ....

[eporue]

Great !! Thank you very much.

Let me copy the full thing just in case someone else wants to use it:

$story = "This is a sample text to convert the words longer than 4 letters 
to a link to an afiliate program that searches for the word, thus generating 
huge amounts of links in a long text automatically. Hope you like it and 
thanks to Weedpacket";

$story = preg_replace('/\b[a-z]{5,}\b/i',"<a href=\"http://www.loslibros.com/principal.cgi?afiliado=ar25179&keywords=\\0\">\\0</a>", $story);

echo $story . "<br>";

Again, thank you. By the way, any good place to learn about Regex ??

Eduardo
http://playlingerie.com