使用RegEx匹配部分字符串内容？

Question

我在创建正则表达式以匹配这些内置组时需要一些帮助:

Domain Admins
Enterprise Admins
Exchange All Hosted Organizations
Exchange Domain Servers
Exchange Enterprise Servers
Exchange Install Domain Servers
Exchange Organization Administrators
Exchange Public Folder Administrators
Exchange Recipient Administrators
Exchange Servers
Exchange Trusted Subsystem
Exchange View-Only Administrators
Exchange Windows Permissions
Recipient Management
Organization Management

我尝试了以下匹配模式，但它给了我一些错误：

$groups_to_ignore = ('Enterprise', 'Admins', 'Organization', 'Exchange')
$reExcludeObjects = '^(\s[a-z-]+){1,3}$' -f (($groups_to_ignore | ForEach-Object { [regex]::Escape($_) }) -join '|')
$reExcludeObjects

错误代码:

Error formatting a string: Index (zero based) must be greater than or equal to zero and less than the size of the argument list..
At line:2 char:1
+ $reExcludeObjects = '^(\s[a-z-]+){1,3}$' -f (($groups_to_ignore | For ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (^(\s[a-z-]+){1,3}$:String) [], RuntimeException
    + FullyQualifiedErrorId : FormatError

这是预览：https://regex101.com/r/WKal3Y/1

Answer 1

您需要像这样构建模式：

$reExcludeObjects = '^(?:{0})(\s[a-z-]+){{1,3}}$' -f (($groups_to_ignore | ForEach-Object { [regex]::Escape($_) }) -join '|')

这将导致

PS> $reExcludeObjects
^(?:Enterprise|Admins|Organization|Exchange)(\s[a-z-]+){1,3}$

因此，重点是对< code>-f字符串使用< code>{0}占位符，对文字大括号使用双大括号。

Answer 2

为什么不使用Select-String对您的模式稍加修改呢？

'Domain Admins
Enterprise Admins
Exchange All Hosted Organizations
Exchange Domain Servers
Exchange Enterprise Servers
Exchange Install Domain Servers
Exchange Organization Administrators
Exchange Public Folder Administrators
Exchange Recipient Administrators
Exchange Servers
Exchange Trusted Subsystem
Exchange View-Only Administrators
Exchange Windows Permissions
Recipient Management
Organization Management
' | Out-File -FilePath 'D:\Temp\BuiltInGroups.txt'

Clear-Host
Get-Content -Path 'D:\Temp\BuiltInGroups.txt' | 
ForEach-Object {$PSItem | Select-String -Pattern '^((?!Enterprise|Organization|Exchange).)*$'}
# Results
<#
Domain Admins
Recipient Management
#>