docs: public static String extractHtml(String content, String startpoint, String endpoint) {
  
          /** Regex that matches a start body tag. */
          Pattern startPattern = Pattern.compile(startpoint, Pattern.CASE_INSENSITIVE);
  
          /** Regex that matches an end body tag. */
          Pattern endPattern = Pattern.compile(endpoint, Pattern.CASE_INSENSITIVE);
  
          Matcher startMatcher = startPattern.matcher(content);
          Matcher endMatcher = endPattern.matcher(content);
  
          int start = 0;
          int end = content.length();
  
          if (startMatcher.find()) {
              start = startMatcher.end();
          }
  
          if (endMatcher.find(start)) {
              end = endMatcher.start();
          }
  
          return content.substring(start, end);
      }