delete unknown characters from my form data?

I want function

Delete all this characters from my forms

开发者_JAVA百科

!@#$%^&*()-_+~`'";\|][/.,~

Only accept English characters linke (abcdefgh ....)

to use it in my registration form

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$text = "something$^£^£$&£";
$text= preg_replace('/[^\w\d_ -]/si', '', $text);
echo $text; // output something

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Have a look at inbuilt PHP functions :

http://www.php.net/manual/en/function.filter-input.php

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You can use :jQuery plugin: Validation.

It's powerful