我编写了一些正则表达式代码，试图与嵌套的Begin-End代码块匹配，就像在Pascal语言中一样。示例：

begin
     begin
       stuff1
     end
   end

   begin
       stuff2
   end

当我通过下面的代码运行时，我希望匹配：

begin
     begin
       stuff1
     end
   end

去掉最后一对“Begin Stuff2 End”...
以下是我使用Windows PowerShell作为脚本语言的尝试：

### POWERSHELL

$ErrorActionPreference = 'Stop';

# Want to match balanced begin-end block include nested begin-end:

# begin begin stuff1 end end

$t1 = ""
$t1 += "  begin"
$t1 += "     begin"
$ti += "      stuff1"
$t1 += "     end"
$t1 += "  end"
$t1 += ""
$t1 += "  begin"
$ti += "      stuff2"
$t1 += "  end"

write-host "LINE: $t1"

$rxop = [Text.RegularExpressions.RegexOptions]::IgnorePatternWhitespace -bor
        [Text.RegularExpressions.RegexOptions]::IgnoreCase

$rx = [Regex]::new(
       "^(
        \bbegin\b             
        (?:  
            (?<openp> \bbegin\b )
            |                    
            (?<-openp> \bend\b )
            |
            [^\t]+   
        )+ 

        (?(openp)(?!))

       \bend\b)
   ", 
   $rxop
)

$match = $rx.Match($t1)

if ($match.Success) {
    $name  = $match.Groups[1].Value
    write-host "matched: $name"
}
else {
    write-host "no-match"
}

基本上它是行不通的。