If you need to remove all special characters, grammar, punctuation and spaces from a string in PHP, this nice regular expression (regex) is just what you need.

$string = 'Hello, this is a SENTENCE!!';
$result = preg_replace('/[^a-zA-Z0-9-_\.]/','', $string);

The above would output:

[/code]
HellothisisaSENTENCE
[/code]

If you wanted to make it all lowercase, you would do the following:

$string = 'Hello, this is a SENTENCE!!';
$result = strtolower(preg_replace('/[^a-zA-Z0-9-_\.]/','', $string));
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