def __init__(self, data, url):
self.data = data<EOL>self.base_url = self.url = url<EOL>m = self._base.search(self.data)<EOL>if m:<EOL><INDENT>self.base_url = m.group(<NUM_LIT:1>)<EOL><DEDENT>
Initialise an instance with the Unicode page contents and the URL they
came from.