Powershell-洗掉以多個字串開頭的行-有解無憂

我希望有人可以幫助我。我已經從 PFX 中提取了證書，并希望洗掉所有以空格、“Bag Attributes”、“issuer”和“subject”開頭的行。我的輸入檔案看起來像這樣：

Bag Attributes
    friendlyName: BLAH BLAH
    BLAH BLAH BLAH
subject=C = BLAH BLAH BLAH 
issuer=C = BLAH BLAH BLAH 
-----BEGIN CERTIFICATE-----
BLAH BLAH BLAH
BLAH BLAH BLAH 
-----END CERTIFICATE-----
Bag Attributes
    friendlyName: BLAH BLAH
    BLAH BLAH BLAH
subject=C = BLAH BLAH BLAH 
issuer=C = BLAH BLAH BLAH 
-----BEGIN CERTIFICATE-----
BLAH BLAH BLAH
BLAH BLAH BLAH 
-----END CERTIFICATE-----
Bag Attributes
    friendlyName: BLAH BLAH
    BLAH BLAH BLAH
subject=C = BLAH BLAH BLAH 
issuer=C = BLAH BLAH BLAH 
-----BEGIN CERTIFICATE-----
BLAH BLAH BLAH 
BLAH BLAH BLAH 
-----END CERTIFICATE-----

輸出應如下所示：

我嘗試使用以下方法洗掉以空格開頭的行，但是無法成功洗掉以“Bag Attrubutes”、“subject”和“issuer”開頭的行，并帶有 { $_ -notmatch "^ ","^subject ","^issuer","^Bag 屬性" }

Get-Content "C:\ScriptRepository\Certs\CA-Chain.pem" | 
Where { $_ -notmatch "^ " } | 
Set-Content "C:\ScriptRepository\Certs\CA-chain2.pem"

任何幫助將不勝感激。

uj5u.com熱心網友回復：

如果你在一個檔案中有它，只需使用switch一個非常簡單的正則運算式：

$result = switch -Regex -File 'X:\InputFile.pfx' {
    '^(Bag|subject|issuer|\s)'  { <# skip these lines #> }
    default { $_ }
}
$result | Set-Content -Path "C:\ScriptRepository\Certs\CA-chain2.pem"

輸出：

正則運算式詳細資訊：

^                 Assert position at the beginning of the string
(                 Match the regular expression below and capture its match into backreference number 1
                  Match either the regular expression below (attempting the next alternative only if this one fails)
      Bag         Match the characters “Bag” literally
   |              Or match regular expression number 2 below (attempting the next alternative only if this one fails)
      subject     Match the characters “subject” literally
   |              Or match regular expression number 3 below (attempting the next alternative only if this one fails)
      issuer      Match the characters “issuer” literally
   |              Or match regular expression number 4 below (the entire group fails if this one fails to match)
      \s          Match a single character that is a “whitespace character” (spaces, tabs, line breaks, etc.)
)

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