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获取字符串中顶级域名代码

<br /> http://xxx.com/123.html<br /> http://www.xxx.com/123.html<br /> http://www.xxx.com.cn/123.html<br /> http://www.xxx.org/123.html<br /> http://a.www.xxx.net/123.html<br /> http://a.b.www.xxx.com/123.html<br /> http://a.b.c.www.xxx.net.cn/123.html
<script type="text/网页特效">
var s = b.value.split("n");
var a = [];
var re = new regexp("http://.*?([^.]+.(com.cn|org.cn|net.cn|[^.]+))/.+", "i");
for(var i = 0; i < s.length; i ++){
 if(re.test(s[i])){
  a.push(s[i].match(re)[1]);
 }
 else{
  a.push("并非合法域名");
 }
}
alert(a.join("n"));
</script>

php教程做法

$arr = array(
    "http://xxx.com/123.html",
    "http://www.xxx.com/123.html",
    "http://www.xxx.com.cn/123.html",
    "http://www.xxx.org/123.html",
    "http://a.www.xxx.net/123.html",
    "http://a.b.www.xxx.com/123.html",
    "http://a.b.c.www.xxx.net.cn/123.html"
);
$re = "/http://.*?([^.]+.(com.cn|org.cn|net.cn|[^.]+))/.+/";
$ra = array();
for($i = 0; $i < count($arr); $i ++){
    if(preg_match($re, $arr[$i])){
        preg_match_all($re, $arr[$i], $res, preg_pattern_order);
        $ra[] = $res[1][0];
    }
    else{
        $ra[] = "并非合法域名";
    }
}
print_r(join("rn", $ra));
?>

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