我的字符串如下：
String tweet = "#Insurgent is No. 1 in 72 of 76 markets where it opened this weekend #BoxOffice http://t.co/Y1Cdjl5JQ8 http://t.co/442WKZVcOq";
我希望它将字符串转换为以下内容：
"#Insurgent is No. 1 in 72 of 76 markets where it opened this weekend #BoxOffice <a>http://t.co/Y1Cdjl5JQ8</a> <a>http://t.co/442WKZVcOq</a>";
所以我想检查网址的字符串并用锚标记包装。