如何使用正则表达式删除只有“11.x”模式的字符串？

Question

I have a list of values,

lst = ['python 3.x', 'java', 'pandas', '12.1.x/11.x', '7.x/8.x']

I want to replace the last two values with empty string ['12.1.x/11.x', '7.x/8.x']

How can I use regex to replace them with empty strings which generalizes across similar pattern?

pattern = re.sub('\d+\.x\/\d+\.x', '', lst[3]) # this is not working

Answer 1

You need to make sure to use anchors and specify that a second version number is optional:

^(?:\d+\.)+(?:x|\d+)(?:/(?:\d+\.)+(?:x|\d+))?$

https://regex101.com/r/c0CDr5/1

I have no clue how to apply this correctly with Python so check out the Code Generator at the link above.