Powershell Regex用于字符串随机分为回车符

Question

我正在寻找一个文本块中的IP字符串，该字符串通常将IP地址除以回车符。例如......

 e c t i o n                  
                                                                    1 9 2 
. 1 6 8 . 1 . 2 5 0       S t a t i o n

我想匹配整个IP地址。我试过做一个积极的向前看/看起来好像......

(?<=1 9 2)\S+?(?=2 5 .)

有什么想法吗？

Answer 1

回车只是另一个空格字符（\s）。

你可以使用1-3个数字的非捕获组（(?:pattern)），然后用空格来匹配整个ip：(?:(?:(?:\d\s+){1,3})\.\s+){3}(\d\s+){0,2}\d

$string = @"
 e c t i o n                  
                                                                    1 9 2 
. 1 6 8 . 1 . 2 5 0       S t a t i o n
"@

$Match = $string |Select-String '(?:(?:(?:\d\s+){1,3})\.\s+){3}(\d\s+){0,2}\d' 
$IP = $Match.Matches.Value -replace '\s+'

Answer 2

描述

((?:(?:[0-9](?:\s[\n\r]|[\r\n]\s|\s)){1,3}(?:\.\s[\n\r]?|\.[\n\r]\s)){3}(?:[0-9](?:\s[\n\r]|[\r\n]\s|\s)){1,3})

此正则表达式将执行以下操作：

• 匹配看起来像IP地址的子字符串
• 允许跨多行划分IP地址

实施例

现场演示

https://regex101.com/r/sG8qS5/3

示例文字

IP address 1    1 9 2 
. 1 6 8 . 1 . 2 5 0       S t a t i o n
 e c t i o n                  

IP address 2                1 9 2 . 1 6 
8 . 1 . 2 5 0       S t a t i o n

IP address 3                1 9 2 . 1 6 
8 . 1 . 2
 5 0       S t a t i o n

样本匹配

MATCH 1
1.  [16-43] `1 9 2 
. 1 6 8 . 1 . 2 5 0 `

MATCH 2
1.  [123-150]   `1 9 2 . 1 6 
8 . 1 . 2 5 0 `

MATCH 3
1.  [199-227]   `1 9 2 . 1 6 
8 . 1 . 2
 5 0 `

解释

NODE                     EXPLANATION
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    (?:                      group, but do not capture (3 times):
----------------------------------------------------------------------
      (?:                      group, but do not capture (between 1
                               and 3 times (matching the most amount
                               possible)):
----------------------------------------------------------------------
        [0-9]                    any character of: '0' to '9'
----------------------------------------------------------------------
        (?:                      group, but do not capture:
----------------------------------------------------------------------
          \s                       whitespace (\n, \r, \t, \f, and "
                                   ")
----------------------------------------------------------------------
          [\n\r]                   any character of: '\n' (newline),
                                   '\r' (carriage return)
----------------------------------------------------------------------
         |                        OR
----------------------------------------------------------------------
          [\r\n]                   any character of: '\r' (carriage
                                   return), '\n' (newline)
----------------------------------------------------------------------
          \s                       whitespace (\n, \r, \t, \f, and "
                                   ")
----------------------------------------------------------------------
         |                        OR
----------------------------------------------------------------------
          \s                       whitespace (\n, \r, \t, \f, and "
                                   ")
----------------------------------------------------------------------
        )                        end of grouping
----------------------------------------------------------------------
      ){1,3}                   end of grouping
----------------------------------------------------------------------
      (?:                      group, but do not capture:
----------------------------------------------------------------------
        \.                       '.'
----------------------------------------------------------------------
        \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
        [\n\r]?                  any character of: '\n' (newline),
                                 '\r' (carriage return) (optional
                                 (matching the most amount possible))
----------------------------------------------------------------------
       |                        OR
----------------------------------------------------------------------
        \.                       '.'
----------------------------------------------------------------------
        [\n\r]                   any character of: '\n' (newline),
                                 '\r' (carriage return)
----------------------------------------------------------------------
        \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
      )                        end of grouping
----------------------------------------------------------------------
    ){3}                     end of grouping
----------------------------------------------------------------------
    (?:                      group, but do not capture (between 1 and
                             3 times (matching the most amount
                             possible)):
----------------------------------------------------------------------
      [0-9]                    any character of: '0' to '9'
----------------------------------------------------------------------
      (?:                      group, but do not capture:
----------------------------------------------------------------------
        \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
        [\n\r]                   any character of: '\n' (newline),
                                 '\r' (carriage return)
----------------------------------------------------------------------
       |                        OR
----------------------------------------------------------------------
        [\r\n]                   any character of: '\r' (carriage
                                 return), '\n' (newline)
----------------------------------------------------------------------
        \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
       |                        OR
----------------------------------------------------------------------
        \s                       whitespace (\n, \r, \t, \f, and " ")
----------------------------------------------------------------------
      )                        end of grouping
----------------------------------------------------------------------
    ){1,3}                   end of grouping
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------