def get_pattern(self, url):
path = urlparse(url).path<EOL>directories, filename = os.path.split(path)<EOL>if len(filename) > <NUM_LIT:0>:<EOL><INDENT>pattern = self.get_pattern_for_filename(filename)<EOL>if directories[-<NUM_LIT:1>] != "<STR_LIT:/>":<EOL><INDENT>directories += "<STR_LIT:/>"<EOL><DEDENT>return directories + pattern<EOL><DEDENT>else:<EOL><INDENT>return self.get_pattern_for_directory(directories)<EOL><DEDENT>
Return the path part of the URL with the last element replaced with its pattern in a regex-like format:
        \l -> lowercase letters, same as [a-z]+
        \L -> uppercase letters, same as [A-Z]+
        \i -> letters ignoring case, same as [a-zA-Z]+
        \d -> digits, same as \d+
        \w -> word characters (letters, digits, underscores), same as \w+
        All other characters match themselves