Regex访问两个下划线之间的数字

Question

我正在尝试访问两个下划线之间的数字。例如，在下面的文本中

https://http-google-ghh.vault.com__929091__2.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__929090__1.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__1205024__1.0
https://http-google-ghh.vault.com__929090__1.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__1205024__1.0

我只需要得到929091、929092等号码

我试过'_(.*)_'，但我也得到了下划线。我只需要电话号码

Answer 1

使用

re.findall(r'__([0-9]+)__', s)

见regex proof

解释

                                        
  __                       '__'
                                        
  (                        group and capture to \1:
                                        
    [0-9]+                   any character of: '0' to '9' (1 or more
                             times (matching the most amount
                             possible))
                                        
  )                        end of \1
                                        
  __                       '__'

Python code：

import re
s = r"""https://http-google-ghh.vault.com__929091__2.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__929090__1.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__1205024__1.0
https://http-google-ghh.vault.com__929090__1.0
https://http-google-ghh.vault.com__929092__2.0
https://http-google-ghh.vault.com__1205024__1.0"""
print(re.findall(r'__([0-9]+)__', s))

结果：['929091', '929092', '929090', '929092', '1205024', '929090', '929092', '1205024']