function isUrl($s)
{
return preg_match('/^http[s]?:\/\/'.
	'(([0-9]{1,3}\.){3}[0-9]{1,3}'. // IP形式的URL- 199.194.52.184
	'|'. // 允許IP和DOMAIN（域名）
	'([0-9a-z_!~*\'()-]+\.)*'. // 域名- www.
	'([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\.'. // 二級域名
	'[a-z]{2,6})'.  // first level domain- .com or .museum
	'(:[0-9]{1,4})?'.  // 埠- :80
	'((\/\?)|'.  // a slash isn't required if there is no file name
	'(\/[0-9a-zA-Z_!~\'\(\)\[\]\.;\?:@&=\+\$,%#-\/^\*\|]*)?)$/',
	$s) == 1;
}