regex - filtering out chinese utf8 characters

[Merlin Morgenstern <merlin_x@xxxxxxxxxxx>]

Hi there,

I am trying to filter out content that is not ascii. Can I do this with 
regex? For example:

	$regex = '[AZ][09]';
	if (preg_match($regex, $text)) {
		return TRUE;
	}
	else {
		return FALSE;
	}

The reason I need to do this is that I am doing a mysql query with the 
text and I need to make sure it is not UTF8. Otherwise I do get 
following error:

Error: 		Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and 
(utf8_general_ci,COERCIBLE) for operation '='

I am new to regex and would be happy for a jump start to get this fixed.

Best regards, Merlin

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