word extraction script

[jokerbla]

Hi, I'm doing a script that extracts words(only once, unique) from multiple text files (all in a folder).

I've used regexp before, but I forgot the syntax for the patern.

So far for extraction from one file I have:

<?php
$file = file_get_contents ('1.txt');

$patern= '???';
$sp = preg_split('/ /', preg_replace($patern,' ',$file));
$sp = array_unique($sp);

 

What do I write at the patern? I need to replace all other characters(like    :, "- ',' . )( "�'          ) except letters, with spaces so I can later extract everything except space and write it down in another txt file.

[jokerbla]

Sort of figured the above out. I have another question.

How do I replace a character lets say " - " followed by a new line or a line break \n \t ?

 

$file = preg_replace('/ [\'-\r\']|[\'-\n\'] /','',$file));

 

This  doesn't seem to work.

[ZachMEdwards]

You'd use a pattern like:

'/-[\r\n\t]/'