use non-greedy .*? since re.sub doesn't accept flags in Python 2.6

Co-Authored-By: Alex Domingo <[email protected]>

Author: boegel

easybuild/tools/filetools.py

@@ -499,7 +499,7 @@ def pypi_source_urls(pkg_name):
 
         # ignore yanked releases (see https://pypi.org/help/#yanked)
         # see https://github.com/easybuilders/easybuild-framework/issues/3301
-        urls_txt = re.sub('^.*data-yanked.*$', '', urls_txt, flags=re.M)
+        urls_txt = re.sub(r'<a.*?data-yanked.*?</a>', '', urls_txt)
 
         parsed_html = ElementTree.ElementTree(ElementTree.fromstring(urls_txt))
         if hasattr(parsed_html, 'iter'):