<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def remove_regex(urls, regex):
 """ Parse a list for non-matches to a regex. Args: urls: iterable of urls regex: string regex to be parsed for Returns: list of strings not matching regex """


    if not regex:
        return urls

    # To avoid iterating over the characters of a string
    if not isinstance(urls, (list, set, tuple)):
        urls = [urls]

    try:
        non_matching_urls = [url for url in urls if not re.search(regex, url)]
    except TypeError:
        return []

    return non_matching_urls