Simplify overly complicated regex

To use re module just to get the basename without the extension is
not pythonic ;)
=> Use os.path.splitext and os.path.basename which is more readable.

src/sdsc/__init__.py

@@ -677,8 +677,7 @@ def initialize():
 
     for checkfile in checkfiles:
         try:
-            checkmodule = re.sub(r'^.*/', r'', checkfile)
-            checkmodule = re.sub(r'.xslc$', r'', checkmodule)
+            checkmodule = os.path.splitext(os.path.basename(checkfile))[0]
             transform = etree.XSLT(etree.parse(checkfile, XMLParser))
             prepared_checks.append({'name': checkmodule, 'transform': transform})
         except Exception as error: