"""Regex utils."""

import re


def is_recognisable_app(app=None):
    """Is this app either oa or alw."""
    if app and re.match('^(?:oa|alw)$', app):
        return True
    else:
        return False


def is_recognisable_user_id(user_id=None):
    """Is this a correctly formatted user id string such as oa:123."""
    if user_id and re.match('^(?:oa|alw):\d+$', user_id):  # noqa
        return True
    else:
        return False