powershell - How to select between multiple lines in power shell?

Question

I am using Get-Content (gc) here. I need to delete a set of lines defined by the start and end marker. But for some reasons, the command that I use does not work. Do you know what I am missing here?

Command that I have tried:

powershell -Command ((gc test.txt) -replace '"/#start.*#end/gms"','')

test.txt:

line1
line2
#start
line3
line4
#end
line5

Expected output:

line1
line2
line5

Answer 1

Get-Content reads the file into an Array of strings. Use Get-Content -Raw to read it as one string.

powershell -Command ((Get-Content -Path test.txt -Raw) -replace '(?smi)#start(.*)#end
?
','')