正则表达式到Python上的单词匹配

Question

I'm trying to create a regex for extracting the software name and the version (if exist) from a Nmap output for example :

ftp (product: vsftpd version: 2.3.4 ostype: Unix)

I applied the regex : /product: (.*) version: (.*)/

It gives the result :

group(1) = vsftpd ,  group(2) = 2.3.4 ostype: Unix 

while I only need the version (2.3.4)

Add to that the version should be optional I tried different things but it doesn't work Example :

product: Apache Jserv extrainfo: Protocol v1.

As there is no version I only need the part of `Apache Jserv '

How do i make all of this ?

Answer 1

使用此正则表达式演示 ：

product: ([\w ]+)(?:version: ([\w.]+)| \w+:)

Answer 2

只需忽略空格即可解决您的第一个问题，然后在没有空格的情况下使用Alternate不返回版本。

(?<=product|version):\s(\S*)