Additional reviewers can be added manually based on PR contents
  @param {!object}
    github enables querying for PR and also create issue using rest endpoint
    context has the commit message details in the payload
  @return {string} Returns the message with labels attached and assignees added
*/
const filter_action = async ({github, context, domain}) => {
  const labels = ['kokoro:force-run'];

  let assignees = [];

    const regex = makeRegex(pattern, ignoreCase)

    return new IgnoreRule(
        origin,
        pattern,
        negative,
        regex
    )
}

const throwError = (message, Ctor) => {
    throw new Ctor(message)
}

const checkPath = (path, originalPath, doThrow) => {
    if (!isString(path)) {
        return doThrow(
            `path must be a string, but got \`${originalPath}\``,

  const rollback_commit = context.payload.head_commit.id;
  const pr_match_groups = context.payload.head_commit.message.match(/\Rollback of PR #(\d+).*/) || [];
  if (pr_match_groups.length != 2) {
    console.log(`PR Number not found in ${context.payload.head_commit.message}`);
    throw "Error extracting PR Number from commit message";
  }
  const pr_number = parseInt(pr_match_groups[1]);
  const owner = context.payload.repository.owner.name;

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