old_contents: from re import search
  
  "Some baseline features for testing the classifier."
  
  def make_searcher(substring, field='content'):
  	def result(datum):
  		if search(substring, datum.__dict__[field]):
  			return ['has_substring_' + substring]
  		else:
  			return []
  	return result
  
  def f2(datum):
  	return [str(len(datum.content) % 8)]
  
  def f3(datum):
  	return [str(len(datum.article_url) % 8)]
  
  def f4(datum):
  	return [str(len(datum.feed_url) % 8)]
  
  feature_templates = [make_searcher('confirmed'), f2, f3, f4]
  
new_contents: from re import search, IGNORECASE
  
  "Some baseline features for testing the classifier."
  
  def make_searcher(substring, field='content', flags=IGNORECASE):
  	def result(datum):
  		if search(substring, datum.__dict__[field], flags):
  			return ['has_substring_' + substring]
  		else:
  			return []
  	return result
  
  def f2(datum):
  	return [str(len(datum.content) % 8)]
  
  def f3(datum):
  	return [str(len(datum.article_url) % 8)]
  
  def f4(datum):
  	return [str(len(datum.feed_url) % 8)]
  
  feature_templates = [make_searcher('confirmed'), f2, f3, f4]
  
subject: Allow for case insensitivity (and any other flag).