docs: public static String extractRegexGroup(String fromContent, Pattern regex, int groupNumber) throws Exception {
          if (fromContent == null) {
              throw new Exception("Cannot extract regex group because the provided content string is null.");
          }
          if (regex == null) {
              throw new Exception("Cannot extract regex group because the provided regular expression is null.");
          }
          if (groupNumber < 0) {
              throw new Exception("Group number to extract must be non-negative. Provided group number was " + groupNumber);
          }
          Matcher matcher = regex.matcher(fromContent);
          if (!matcher.find()) {
              throw new Exception("Did not find any matches for regex [" + regex + "] in the provided content: [" + fromContent + "].");
          }
          if (matcher.groupCount() < groupNumber) {
              throw new Exception("Found " + matcher.groupCount() + " matching groups in the content, but expected at least " + groupNumber + ". Regex was [" + regex + "] and content was [" + fromContent + "].");
          }
          return matcher.group(groupNumber);
      }