Function to strip all but letters, numbers, and _?

Does anyone have a handy-dandy function they can quickly post that strips
everything from a string except for letters, numbers, & underscores?

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[ Sugapablo ]
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On Sat, 15 Jan 2005 14:59:18 -0500, Sugapablo <russ@REMOVEsugapablo.com>
wrote:

> Does anyone have a handy-dandy function they can quickly post that strips
> everything from a string except for letters, numbers, & underscores?

$stripped = preg_replace('/[^a-z0-9_]/i','',$string);


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*** Sugapablo escribió/wrote (Sat, 15 Jan 2005 14:59:18 -0500):
> Does anyone have a handy-dandy function they can quickly post that strips
> everything from a string except for letters, numbers, & underscores?

function strip_all_but_letters_numbers_and_underscores($tex t){
return preg_replace('/[^\w\d_]+/', '', $text);
}

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"Alvaro G. Vicario" <kAlvaroNOSPAMTHANKS@terra.es> wrote in message
news:1uzyis8ekuxw9.v2x1zufftpv4.dlg@40tude.net...
> *** Sugapablo escribió/wrote (Sat, 15 Jan 2005 14:59:18 -0500):
> > Does anyone have a handy-dandy function they can quickly post that
strips
> > everything from a string except for letters, numbers, & underscores?
>
> function strip_all_but_letters_numbers_and_underscores($tex t){
> return preg_replace('/[^\w\d_]+/', '', $text);
> }
>
> --
> -+ Álvaro G. Vicario - Burgos, Spain
> +- http://www.demogracia.com (la web de humor barnizada para la
intemperie)
> ++ Las dudas informáticas recibidas por correo irán directas a la papelera
> -+ I'm not a free help desk, please don't e-mail me your questions
> --

Eh, \w includes digits and the underscore. Also, capital letters are used to
denote "not a meta character." Hence the following:

preg_replace('/\W+/', '', $text);

*** Chung Leong escribió/wrote (Sat, 15 Jan 2005 23:07:33 -0500):
> Eh, \w includes digits and the underscore. Also, capital letters are used to
> denote "not a meta character." Hence the following:
>
> preg_replace('/\W+/', '', $text);

Absolutely right. My code is what happens when you trust your memory :)

--
-+ Álvaro G. Vicario - Burgos, Spain
+- http://www.demogracia.com (la web de humor barnizada para la intemperie)
++ Las dudas informáticas recibidas por correo irán directas a la papelera
-+ I'm not a free help desk, please don't e-mail me your questions
--