def build_url(label, base, end):
    clean_label = re.sub(r'([ ]+_)|(_[ ]+)|([ ]+)', '_', label)
    return '%s%s%s' % (base, clean_label, end)
Target database must support subqueries.
dataset/ETHPy150Open dragondjf/QMarkdowner/markdown/extensions/wikilinks.py/build_url--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/testing/requirements.py/SuiteRequirements.subqueries