Implement expression search in dirlist

__init__.py

 """The Tested Interpreter-Versions"""
 
 
-def dirlist(path='.', rekursive=True):
+def dirlist(path='.', expression='*', rekursive=True):
     """
     Function returning a list of directories below a given path.
 
     :param str path: folder which is the basepath for searching files.
+    :param str expression: expression to fit including shell-style wildcards. It is only used for the first directory level, if rekursive is set to True.
     :param bool rekursive: search all subfolders if True.
     :returns: list of filenames including the pathe
     :rtype: list
     li = list()
     if os.path.exists(path):
         logger.debug('DIRLIST: path (%s) exists - looking for directories to append', path)
-        for dirname in os.listdir(path):
-            fulldir = os.path.join(path, dirname)
-            if os.path.isdir(fulldir):
-                li.append(fulldir)
+        for dirname in glob.glob(os.path.join(path, expression)):
+            if os.path.isdir(dirname):
+                li.append(dirname)
                 if rekursive:
-                    li.extend(dirlist(fulldir))
+                    li.extend(dirlist(dirname))
     else:
         logger.warning('DIRLIST: path (%s) does not exist - empty filelist will be returned', path)
     return li