powershell 正则表达式匹配特定字符串，没有开始特殊字符答案

【问题标题】：powershell regex match specific string w/o starting special characterpowershell 正则表达式匹配特定字符串，没有开始特殊字符
【发布时间】：2021-04-14 20:05:05
【问题描述】：

我有一个与正则表达式匹配的字符串，但相同的字符串在前面用 # 符号注释掉，正则表达式继续匹配我不想要的。

我的正则表达式

BLTY:\w{8}:\w{8}:\w{5}\.\w{7}\.\w{1}\.\w{3}\/\w{3}\/.*\(\w{4}\)

字符串

BLTY:ENCQ0000:SERVER:TEMP.PPMQ8FE.Y.323/TCP/gtg23.dev.pmt.com(3213)-> only match this
#BLTY:ENCQ0000:SERVER:TEMP.PPMQ8FE.Y.323/TCP/gtg23.dev.pmt.com(3213) -> I dont want to match this

试过

^[BLTY:\w{8}:\w{8}:\w{5}\.\w{7}\.\w{1}\.\w{3}\/\w{3}\/.*\(\w{4}\)]

^BLTY:\w{8}:\w{8}:\w{5}\.\w{7}\.\w{1}\.\w{3}\/\w{3}\/.*\(\w{4}\)

(?!#)BLTY:\w{8}:\w{8}:\w{5}\.\w{7}\.\w{1}\.\w{3}\/\w{3}\/.*\(\w{4}\)

另外，如果有一种不那么冗长/优化的方式来编写这个正则表达式，我愿意听

【问题讨论】：

如何从 PowerShell 调用这个正则表达式？这会有所不同，尤其是在使用多行字符时 (^$)

标签： regex powershell regex-negation

【解决方案1】：

无需使用前瞻：

^BLTY(?::\w+){3}(?:\.\w+){3}/.*\(\d+\)$

见regex proof。

解释

--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  BLTY                     'BLTY'
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (3 times):
--------------------------------------------------------------------------------
    :                        ':'
--------------------------------------------------------------------------------
    \w+                      word characters (a-z, A-Z, 0-9, _) (1 or
                             more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
  ){3}                     end of grouping
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (3 times):
--------------------------------------------------------------------------------
    \.                       '.'
--------------------------------------------------------------------------------
    \w+                      word characters (a-z, A-Z, 0-9, _) (1 or
                             more times (matching the most amount
                             possible))
--------------------------------------------------------------------------------
  ){3}                     end of grouping
--------------------------------------------------------------------------------
  /                        '/'
--------------------------------------------------------------------------------
  .*                       any character except \n (0 or more times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \(                       '('
--------------------------------------------------------------------------------
  \d+                      digits (0-9) (1 or more times (matching
                           the most amount possible))
--------------------------------------------------------------------------------
  \)                       ')'
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string

【讨论】：