old_contents: import re
  
  
  class DocTestParser(object):
      """Find all externaltestcaseid's in a test's docstring.
  
      If your externaltestcaseid prefix is abc and the test has 'abc-123' in it's docstring.
      `DocTestParser('abc').get_testcases()` would return `['abc-123']`.
      """
      def __init__(self, doc_matcher=None, doc_matchers=None):
          """
          :param doc_matchers: List of regex to find in docstring
          """
          self.doc_matchers = doc_matchers if doc_matchers is not None else []
          if doc_matcher:
              self.doc_matchers.append(doc_matcher)
  
      def get_testcases(self, test):
          testcases = set()
          for matcher in self.doc_matchers:
              testcases |= set(re.findall('{}-\d+'.format(matcher), test.doc))
          return testcases
  
new_contents: import re
  
  
  class DocTestParser(object):
      """Find all externaltestcaseid's in a test's docstring.
  
      If your externaltestcaseid prefix is abc and the test has 'abc-123' in it's docstring.
      `DocTestParser('abc').get_testcases(test)` would return `['abc-123']`.
      """
      def __init__(self, doc_matcher=None, doc_matchers=None):
          """
          :param doc_matchers: List of regex to find in docstring
          """
          self.doc_matchers = doc_matchers if doc_matchers is not None else []
          if doc_matcher:
              self.doc_matchers.append(doc_matcher)
  
      def get_testcases(self, test):
          testcases = set()
          for matcher in self.doc_matchers:
              testcases |= set(re.findall('{}-\d+'.format(matcher), test.doc))
          return testcases
  
subject: Fix example in docparser docstring