python - 如何用正则表达式进行模式替换？

Question

我想在这个字符串中匹配“windowsXP”:

windowsXP|7|8 

或者

windowsXP 7 8

我写了一个模式来匹配它:

 ([^0-9|])+[0-9\.]+.*

为什么不匹配？这是|在支架上制造麻烦。我试图逃避它，但它也没有奏效。

([^0-9\|])+[0-9\.]+.*

Answer 1

看:

([^0-9|])+查找不同于数字和管道的字符

[0-9\.]+尝试匹配数字或句点，但存在表达式无法捕获的管道。

用

^([^|\s]+)[|\s](\d+)[|\s](\d+)

见 proof
说明

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    [^|\s]+                  any character except: '|', whitespace (1 or more
                             times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  [|\s]                    any character of: '|', whitespace (\n, \r,
                           \t, \f, and " ")
--------------------------------------------------------------------------------
  (                        group and capture to \2:
--------------------------------------------------------------------------------
    \d+                      digits (0-9) (1 or more times (matching
                             the most amount possible))
--------------------------------------------------------------------------------
  )                        end of \2
--------------------------------------------------------------------------------
  [|\s]                    any character of: '|', whitespace (\n, \r,
                           \t, \f, and " ")
--------------------------------------------------------------------------------
  (                        group and capture to \3:
--------------------------------------------------------------------------------
    \d+                      digits (0-9) (1 or more times (matching
                             the most amount possible))
--------------------------------------------------------------------------------
  )                        end of \3

Python code :

import re
regex = r"^([^|\s]+)[|\s](\d+)[|\s](\d+)"
test_str = "windowsXP|7|8"
print(re.findall(regex, test_str))

结果 : [('windowsXP', '7', '8')]