import re


def filter_tests(filters, test_ids):
    """Filter test_ids by the test_filters.

    :param list filters: A list of regex filters to apply to the test_ids. The
        output will contain any test_ids which have a re.search() match for any
        of the regexes in this list. If this is None all test_ids will be
        returned
    :param list test_ids: A list of test_ids that will be filtered
    :return: A list of test ids.
    """
    if filters is None:
        return test_ids
    _filters = list(map(re.compile, filters))

    def include(test_id):
        for pred in _filters:
            if pred.search(test_id):
                return True

    return list(filter(include, test_ids))