old_contents: # vim:fileencoding=utf-8:noet
  from __future__ import (unicode_literals, division, absolute_import, print_function)
  
  import os
  import re
  
  from powerline.bindings.vim import buffer_name
  
  
  NERD_TREE_RE = re.compile(b'NERD_TREE_\\d+')
  
  
  def nerdtree(matcher_info):
  	name = buffer_name(matcher_info)
  	return name and NERD_TREE_RE.match(os.path.basename(name))
  
new_contents: # vim:fileencoding=utf-8:noet
  from __future__ import (unicode_literals, division, absolute_import, print_function)
  
  import os
  import re
  
  from powerline.bindings.vim import buffer_name
  
  
  NERD_TREE_RE = re.compile(b'NERD_tree_\\d+')
  
  
  def nerdtree(matcher_info):
  	name = buffer_name(matcher_info)
  	return name and NERD_TREE_RE.match(os.path.basename(name))
  
subject: Fix case in nerd tree matcher regex