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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _regex_to_static(src, regex):
    '''
    Expand regular expression to static match.
    '''
    if not src or not regex:
        return None

    try:
        compiled = re.compile(regex, re.DOTALL)
        src = [line for line in src if compiled.search(line) or line.count(regex)]
    except Exception as ex:
        raise CommandExecutionError("{0}: '{1}'".format(_get_error_message(ex), regex))

    return src and src or []