<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def parse_immoweb_link(url):
 """Parses an Immoweb estate detail URL and returns the Immoweb estate id. Returns a string with the Immoweb estate id. """

    IMMOWEB_ID_RE = re.compile(r'.*?IdBien=([0-9]+).*?')
    return IMMOWEB_ID_RE.match(url).groups()[0]