禁止表单输入某种字符

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>禁止表单输入某种字符</title>
</head>
<body>
<input onkeyup="this.value=this.value.replace(/[\*\^\|]+/,'');" value="" size="20" />
</body>
</html>