正则表达式怎么写

我要在html中匹配
itemUrl = 'http://detail.tmall.com/item.htm?id=529310757468'这个，然后要拿到里面的这个
http://detail.tmall.com/item.htm?id=529310757468。（http://detail.tmall.com/item.htm?id=529310757468）这部分是会变的

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public static void main(String[] args) {
    System.out.println(getTargetUrl("itemUrl = 'http://detail.tmall.com/item.htm?id=529310757468'"));
}

private static String getTargetUrl(String fullUrl) {
    String reg = "itemUrl = '(.*)'";
    Pattern pattern = Pattern.compile(reg);
    Matcher matcher = pattern.matcher(fullUrl);
    if (matcher.find()) {
        return matcher.group(1);
    }

    return null;
}

Pattern和Matcher的具体用法可以参考我的一篇文章https://.com/a/1190000002923343

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preg_match_all('#itemUrl = \'(.*?)\'#i',$html,$matchs);
foreach($matchs as $k=>$v){
    echo $v[1]."\r\n";
}