How to use the citellus.regexpfile function in citellus

:param options: options passed to main binary
    :return:
    """

    if not which("ansible-playbook"):
        print("# skipping ansible per missing ansible-playbook binary.")
        return

    playbooksdir = os.path.join(citellus.citellusdir, PlaybooksFolder)
    playbooks = citellus.findplugins(folders=[playbooksdir], include=options.include, exclude=options.exclude,
                                     executables=False, extension=".yml")
    playbooklive = []
    playbooksnap = []

    for playbook in playbooks:
        if citellus.regexpfile(file=playbook, regexp="CITELLUS_ROOT"):
            playbooksnap.append(playbook)
        else:
            playbooklive.append(playbook)

    # Restrict the playbooks to process to the running mode
    if options.live is True:
        playbooks = playbooklive
        playbookskipped = playbooksnap
    else:
        playbooks = playbooksnap
        playbookskipped = playbooklive

    # There are plugins that can be run in Live and Snapshot mode (Find string CITELLUS_HYBRID), by default the Hybrid
    # ones will be flagged as snapshot mode, so we only process them in case we're running live.

    if options.live is True: