java正则表达式获取指定HTML标签的指定属性值且替换的方法

实例如下：

public static string repdomain(string source, string domain, string element, string attr) {

    string img = "";
    pattern p_image;
    matcher m_image;
    string regex_img = "<" + element + "[^<>]*?\\s" + attr + "=['\"]?(.*?)['\"]?(\\s.*?)?>"; 
    p_image = pattern.compile(regex_img, pattern.case_insensitive);
    m_image = p_image.matcher(source);
    while (m_image.find()) {
      img = m_image.group();
      matcher m = pattern.compile("href\\s*=\\s*\"?(.*?)(\"|>|\\s+)").matcher(img);
      while (m.find()) {
        string srcval = m.group(1);
        if(srcval.indexof("/@tenant")>=0){
        	int idx = srcval.indexof("/@tenant");
        	stringbuffer temp = new stringbuffer();
        	string dstval = temp.append(domain).append(srcval.substring(idx+1)).tostring();
        	source = source.replace(srcval, dstval);
        }
      }
    }
    return source;
  }

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