$ ./pants help-advanced archive-fetcher | grep matchers --archive-fetcher-matchers=<mapping> (default: { 'github\.com/(?P<user>[^/]+)/(?P<repo>[^/]+)':'UrlInfo(url_format=u'https://github.com/\\g&lt;user&gt;/\\g&lt;repo&gt;/archive/{rev}.tar.gz', default_rev=u'master', strip_level=1)','bitbucket\.org/(?P<user>[^/]+)/(?P<repo>[^/]+)':'UrlInfo(url_format=u'https://bitbucket.org/\\g&lt;user&gt;/\\g&lt;repo&gt;/get/{rev}.tar.gz', default_rev=u'tip', strip_level=1)','golang\.org/x/(?P<repo>[^/]+)':'UrlInfo(url_format=u'https://github.com/golang/\\g&lt;repo&gt;/archive/{rev}.tar.gz', default_rev=u'master', strip_level=1)' })