[Fors1k]

Код:

param(
    $pathIn  = "C:\file.txt",
    $pathOut = "C:\file1.txt"
)cls

$text = gc $path -raw
(($text|sls '{i}(\s|\S)*?{/i}'-a).Matches.value)|%{
    $text = $text -replace $_,
    ($_-replace"`r`n"," {/i}`r`n{i} ")
}
$text|Out-File $pathOut