如何用`hostnametld`替换字符串中的所有URL？

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例如：http://stackoverflow.com/questions/ask => stackoverflowcom以下工作，但不适用于在httpsurl 之外的角落情况。import refrom urllib.parse import urlparsedef convert_urls_to_hostnames(s):    try:        new_s = re.sub("http\S+", lambda match: urlparse(match.group()).hostname.replace('.','') if match.group() else urlparse(match.group()).hostname, s)        return new_s    except Exception as e:        print(e)    return s这主要是有效的。s = "Ask questions here: http://stackoverflow.com/questions/ask"print(convert_urls_to_hostnames(s))正确返回： Ask questions here: stackoverflowcom但是，如果http*s在 url 之外的字符串中的任何位置找到它，它就会失败，如下所示：s = "Urls may start with http or https like so: http://stackoverflow.com/questions/ask and https://example.com/questions/"print(convert_urls_to_hostnames(s))这将返回：'NoneType' object has no attribute 'replace'。预期收益： Urls may start with http or https like so: stackoverflowcom and examplecom