Fix regex used in find_versions_of_archive.

Fixes github issue #2, as well as spack create for mvapich.

lib/spack/spack/package.py

@@ -779,15 +779,15 @@ def find_versions_of_archive(archive_url, **kwargs):
     if not list_url:
         list_url = os.path.dirname(archive_url)
     if not wildcard:
-        wildcard = url.parse_version(archive_url).wildcard()
+        wildcard = url.wildcard_version(archive_url)
 
     versions = VersionList()
-    url_regex = os.path.basename(url.wildcard_version(archive_url))
+    url_regex = os.path.basename(wildcard)
 
     page_map = get_pages(list_url, depth=list_depth)
 
     for site, page in page_map.iteritems():
-        strings = re.findall(url_regex, page)
+        strings = set(re.findall(url_regex, page))
 
         for s in strings:
             match = re.search(wildcard, s)

lib/spack/spack/test/url_parse.py

@@ -267,3 +267,8 @@ def test_synergy_version(self):
         self.assert_detected(
             'synergy', '1.3.6p2',
             'http://synergy.googlecode.com/files/synergy-1.3.6p2-MacOSX-Universal.zip')
+
+    def test_mvapich2_version(self):
+        self.assert_detected(
+            'mvapich2', '1.9',
+            'http://mvapich.cse.ohio-state.edu/download/mvapich2/mv2/mvapich2-1.9.tgz')