old_contents: from cla_public.apps.base import base
  
  @base.app_template_filter()
  def test(value):
      return value
  
new_contents: import re
  from cla_public.apps.base import base
  
  @base.app_template_filter()
  def test(value):
      return value
  
  @base.app_template_filter()
  def split(value, pattern):
      return re.split(pattern, value)
  
subject: Add `split` Jinja filter