powershell - 如果将字符串放在一个序列或另一个序列中，为什么使用Powershell 4.0在文本文件中搜索字符串会被忽略？

Question

代码有效，因为result.txt包含WORD_2，PHRASE2，WORD和PHRASE的所有实例:

$output_file = ‘results.txt’
$listtomatch = @("WORD_2", "PHRASE2","WORD",  "PHRASE") 
select-string -Path filetosearchin.txt -Pattern $listtomatch -CaseSensitive | % { $_.Matches } | % { $_.Value } 

代码无效，因为它仅返回WORD和PHRASE的所有实例，但不返回WORD_2或PHRASE2:

$output_file = ‘results.txt’
$listtomatch = @("WORD", "PHRASE","WORD_2",  "PHRASE2") 
select-string -Path filetosearchin.txt -Pattern $listtomatch -CaseSensitive | % { $_.Matches } | % { $_.Value }

字符串的顺序是否会干扰它们输入选择字符串的方式，从而产生不同的结果？

我曾期望上面的两个代码都能得到相同的结果:所有字符串的所有实例:WORD_2，PHRASE2，WORD和PHRASE

Answer 1

让PowerShell创建alternations(|)并还包括-AllMatches参数:

## Q:\Test\2019\07\31\SO_57297393.ps1
$listtomatch = @("WORD_2","PHRASE2","WORD","PHRASE") 

Select-String -Path filetosearchin.txt -Pattern ($listtomatch -join '|') -CaseSensitive -AllMatches| 
   % { $_.Matches } | % { $_.Value }

使用输入文件:

> Get-Content .\filetosearchin.txt
1:"WORD_2","PHRASE2","WORD","PHRASE"
2:"PHRASE2","WORD","PHRASE","WORD_2"
3:"WORD","PHRASE","WORD_2","PHRASE2"
4:"PHRASE","WORD_2","PHRASE2","WORD"

该脚本产生:

> .\SO_57297393.ps1
WORD_2
PHRASE2
WORD
PHRASE
PHRASE2
WORD
PHRASE
WORD_2
WORD
PHRASE
WORD_2
PHRASE2
PHRASE
WORD_2
PHRASE2
WORD