WordPress Helper Function:Convert url's @mentions and hashtags to links

parseTwitterContent.php

function parseTwitterContent($string) {
	$links    = make_clickable($string);
	$patterns = array("/@([a-zA-Z0-9_]+)/", "/#([a-zA-Z0-9_]+)/");
	$replace  = array(
		"<a href='http://twitter.com/$1' target='_blank'>@$1</a>",
		"<a href='http://twitter.com/#$1' target='_blank'>#$1</a>"
	);
	return preg_replace($patterns, $replace, $links);
}