Regex 正则表达式不能用边界条件代替精确匹配

我试图创建一个regex表达式，就像bash中的sed命令一样。替换与“用户服务http”完全匹配的内容，但这也可以作为“用户服务http 2”存在于其他地方，并得到替换

>>> f = "'value: http://ec2-35-171-57-57.compute-1.amazonaws.com:32370ssoeproxy/logout    value: http://ec2-35-171-57-57.compute-1.amazonaws.com:user-services-http-two/ssoeproxy/logout  value: user-services-http #458930'"
>>> re.sub(r'\buser-services-http$', '11111', f)'value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:user-services-http/ssoeproxy/logout    value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:user-services-http-two/ssoeproxy/logout'
>>> re.sub(r'\buser-services-http\b', '11111', f)
'value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:11111/ssoeproxy/logout    value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:11111-two/ssoeproxy/logout'

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你可以用这样的消极展望：

import re

f = "value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:user-services-http/ssoeproxy/logout    value: http://ec2-xxx-xx-xxx-xxx.compute-1.amazonaws.com:user-services-http-two/ssoeproxy/logout"
print(re.sub(r'\buser-services-http\b(?!-[^/]+)/', '11111', f)

输出：

value: http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:11111/ssoeproxy/logout
value: http://ec2-xxx-xx-xxx-xxx.compute-1.amazonaws.com:user-services-http-two/ssoeproxy/logout

确保后面没有紧跟着

-两个
或其他单词。这是通过使用负字符类
[^/]+
来完成的。尝试这种方法的好地方是：

只需在末尾添加一个
/
，即搜索
用户服务http/
，就行了吗？这真的很接近了，但这将取代搜索字符串后面的任何/，就像url一样。通讯：11111 SSOEPROXY/logout@Bohemian我更新了fB的值，但是如果后面有任何字符串呢？这只解决了-2的问题，那么-3或“/”或6789呢？啊，我还以为是-2呢，我已经更新了我的答案