preg_repleace hashtags

in function

public function linkHashtags( $text ) {
		$text = preg_replace_callback('/(^|\s)(#[\w\x{00C0}-\x{00D6}\x{00D8}-\x{00F6}\x{00F8}-\x{00FF}]*)/i', array($this, '_linkHashtagsCallback'), $text);
		return $text;
	}

regex does not support latin chars such as áàéèí?óòúü?? and their uppercase.
i don’t know any regex, so if anyone could help, would much appreciate!
txs.

https://www.ads-software.com/extend/plugins/twitter-widget-pro/