consulta php preg_match y tipos de variables

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#1737

From: Rickoj
Date: Tue, 06 Jun 2006 21:20

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bueno necesito obtener unos datos de un log, buscando en phpclasses.org 
encontre "Apace log parser", mire el archivo con el fin de saar una idea y 
encontre que utiliza la funcion preg_match verifica un patron y si 
corresponde lo almacena en un arreglo, la funcion recibe estos parametros

preg_match("/^(\S+) (\S+) (\S+) \[([^:]+):(\d+:\d+:\d+) ([^\]]+)\] \"(\S+) 
(.*?) (\S+)\" (\S+) (\S+) (\".*?\") (\".*?\")$/", $matches);

mi duda es que no entiendo que es \S+ (asumo string) \d+

alguien me podria explicar se supone que parse el log de apaxhe que es del 
tipo

172.0.0.1 - - [21/Sep/2005:23:06:41 +0100] "GET / HTTP/1.1" 404 - "-" 
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b3) Gecko/20050712 
Firefox/1.0+"

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From: "Rick_oj" <rick_oj@[sin-esto]tutopia.com>
Newsgroups: chile.comp.programacion
Subject: consulta php preg_match y tipos de variables
Date: Tue, 6 Jun 2006 17:20:52 -0400
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