def extract_urls(self, text):
        raise NotImplementedError('Subclasses must define a extract_urls method')
API equivalent to using Cookiecutter at the command line.
dataset/ETHPy150Open worldcompany/djangoembed/oembed/parsers/base.py/BaseParser.extract_urls--crossover with--dataset/ETHPy150Open kivy/kivy-ios/tools/external/cookiecutter/main.py/cookiecutter