PowerShell 正则表达式不起作用 [英] PowerShell regex not working

问题描述

我有以下 PowerShell 脚本:

I have the following PowerShell script:

$SCRIPTNAME = "myfile.js"
$SUBJECT = Get-Content $SCRIPTNAME | Out-String
if ($SUBJECT -match ".*/// COMMENT.*?$(.*)")
{
    echo $matches[1];
}
$Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');

它产生以下错误(我正在尝试使用正则表达式捕获组，但它不起作用):

It is generating the following error (I'm trying to use regex capture groups, but its not working):

.* : The term '.*' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the
spelling of the name, or if a path was included, verify that the path is correct and try again.
At C:\Users\User\Desktop\install.ps1:21 char:39
+ if ($SUBJECT -match ".*/// COMMENT.*?$(.*)")
+                                        ~~
    + CategoryInfo          : ObjectNotFound: (.*:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

为什么第二个捕获组的 .* 部分有问题?

Why is it having issues with the .* part of the second capture group?

推荐答案

明白了.我需要用单引号 ' ' 转义正则表达式，并进一步添加单行和多行说明符 (?sm):

Got it. I needed to escape the regular expression with single quotes ' ', and furthermore add single and multiline specifiers (?sm):

$SCRIPTNAME = "myfile.js"
$SUBJECT = Get-Content $SCRIPTNAME | Out-String
if ($SUBJECT -match '(?sm).*/// COMMENT.*?$(.*)' -and $matches.Count -ge 2)
{
    echo $matches[1];
}
$Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');

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