正则匹配<img>标签

 int i = 0;
//        previewDom = Pattern.compile("<img/s+[^>]*/s*src/s*=/s*([‘]?)(?<url>/S+)‘?[^>]*>").matcher(previewDom).replaceFirst("<!--{img:"+i+"}-->");
        Set<String> pics = new HashSet<>();
        String img = "";
        String regEx_img = "(?is)<img\\s*((?<key>[^=]+)=\"*(?<value>[^\"]+)\")+?\\s*/?>";
        Pattern p_image;
        Matcher m_image;
        p_image = Pattern.compile(regEx_img, Pattern.CASE_INSENSITIVE);
        m_image = p_image.matcher(previewDom);
//        System.out.println();
        String tempStr = previewDom;
        String dealStr = "";
        while (m_image.find()) {
            // 得到<img />数据
            img = m_image.group();
            // 匹配<img>中的src数据
            Matcher m = Pattern.compile("src\\s*=\\s*\"?(.*?)(\"|>|\\s+)").matcher(img);
            while (m.find()) {
                // 获取文章链接,并拼成合适的url
                dealStr = dealStr + PRE_DEAL_STR + i + MID_DEAL_STR + m.group(1) + POST_DEAL_STR;
//                tempStr = previewDom;
                // 将原文链接拼接
                tempStr = tempStr.replace(img, "<!--{img:" + i + "}-->");
                pics.add(m.group(1));
//                tempStr = m_image.replaceFirst("<!--{img:" + i + "}-->");
                i++;
            }
        }