Replace text in multi line string in PowerShell. Below you can find several powershell examples how to replace text in a multi line string with regular expressions.

replace_text_in_multi_line_string_1.ps1

$text = "
This is
__
a multi line
string
__
with some marks in it.
"

# Here we remove a text in the multiline string between two marks
$text = $text -Replace "(?ms)__.*?__`n?`n?", ""

# We use Trim() method to remove new line from the beginning and the end of the string
Write-Output $text.Trim()

replace_text_in_multi_line_string_2.ps1

$text = "
This is
__
a multi line
string
__
with some marks in it.
"

# Here we remove marks in the multiline string
$text = $text -Replace "(?ms)^__`n?`n?", ""

# We use Trim() method to remove new line from the beginning and the end of the string as well
Write-Output $text.Trim()