Windows批处理或PowerShell。 替换“{\\ n}”文本

Question

I've got a text file that contains:

title
{
}

I need to replace {\\n} with "mytext".

I tried to use this:

powershell -Command "(gc file.txt) -replace \"{\n}\", "mytext"

with no success.

Could anyone help me? Thank you.

Answer 1

• In order for -replace to operate across lines , you must read the entire file into memory as a single string , which is what Get-Content -Raw ( gc -raw ) does (PSv3+).

• Additionally, to account for the typical CRLF ( \\r\\n ) line endings on Windows, use \\r?\\n to match both them and LF-only ( \\n ) line endings, as Mathias R. Jessen suggests.

Along with corrections to and simplification of quoting, we get:

powershell -Command "(gc -raw file.txt) -replace '\{\r?\n\}', 'mytext'"

Answer 2

Please view mklement0's answer instead for this question, as mine will not work. I will leave it here as a method of literal string replacement.

---

Give this a shot in a PowerShell console. If it works you can always save it as a script in a .ps1 file.

$FilePath = "\\Server\Share\PathToFile\File.txt"
$ToBeReplaced = "{\n}"
$ReplaceWith = "mytext"
$File = Get-Content $FilePath
$File | foreach { $_.Replace($ToBeReplaced,$ReplaceWith) } | Set-Content $FilePath

Answer 3

Text file that contains:

title
{
}

Goal: replace {\\n} with "mytext".

OP attempted:

powershell -Command "(gc file.txt) -replace \"{\n}\", "mytext"

First, Get-Content doesn't returned the NewLines (by default) but rather an array of strings split on the newlines so this is the most direct translation of the command you attempted:

(Get-Content file.txt) -join 'mytext'

Or use -Raw to prevent Get-Content from spliting and to just return one string:

(get-content -raw .\PSRLKeyBindings.txt) -replace '\n', 'mytext'

This works without using the Regex multiline modifiers etc. (I was uncertain that would be the case until I tested.)

If you really wish to run it from some arbitrary place (cmd.exe, Run dialog, called from a shortcut) then you need the "powershell -command" but if you just run it from the PowerShell console then you can omit that as above.

Here's the "starting PowerShell version -- though I use -noprofile because my extensive profile takes about 10 seconds to initialize:

powershell -noprofile -Command "(get-content -first 10 .\PSRLKeyBindings.txt) -join 'mytext'"

The quotes are necessary to make it all on "command parameter" -- or you can wrap it in curly braces -command { command here }