php loopping error 10x deprecated function eregi() is deprecated

<?php
function my_connect() {
	@mysql_connect("localhost", "root", "321654") or die(mysql_error());
	@mysql_select_db("webboard") or die(mysql_error());
}

$str = "xxxbbnyyynmkfghthbzzz";

function has_rudeword($str) {			 	
	$rudes = array("xxx", "yyy", "zzz"); 		//
	
	for($i = 0; $i < count($rudes); $i++) {
		if(eregi($rudes[$i], $str)) {
			return true;
		}
	}
	return false;
}

if(has_rudeword($str) === true)
{
echo "True";
}
else
{
echo "False";
}
?>