正则表达式访问两个下划线之间的数字答案

【问题标题】：Regex to access digits between two underscores正则表达式访问两个下划线之间的数字
【发布时间】：2021-09-14 19:55:16
【问题描述】：

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

我只需要获取数字 929091、929092 等。

我试过'_(.*)_'，但我也得到了下划线。我只需要号码

【问题讨论】：

re.findall(r'_(\d+)_', text)
类似_(\d+)_？匹配下划线之间的一位或多位数字。
re.findall(r'(?

标签： python regex pandas

【解决方案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']

【讨论】：

它也打印下划线。我只需要数字。有什么方法可以只获取数字而不是下划线吗？
@IttyBit 代码已添加。没有下划线。你怎么看下划线？
非常感谢。我在 Redshift 中运行时看到了下划线。