Clean utm parameters on link.

sanitilize_link.py

import re
import urlparse


def linky(url):
    """Sanitize link. clean utm parameters on link."""
    if not re.match(r'^https?:\/\/', url):
        url = 'http://%s' % url

    rv = urlparse.urlparse(url)

    if rv.query:
        query = re.sub(r'utm_\w+=[^&]+&?', '', rv.query)
        url = '%s://%s%s?%s' % (rv.scheme, rv.hostname, rv.path, query)

    # remove ? at the end of url
    url = re.sub(r'\?$', '', url)
    return url

what if we have url="https://www.idc.com/getdoc.jsp?containerId=prJPJ47694621&utm_medium=rss_feed&utm_source=alert&utm_campaign=rss_syndication"

it will not clean the url, "&" special char still there in url.
OR
Is there any way to do all regex subtraction in one expression.