Find files which does not contains selected string

Question

I am trying to find all files, which does not contains a selected string. Find files which contains is easy:

gci | select-string "something"

but I do not have an idea how to negate this statement.

Answer 1

I'm not sure if it can be done without the foreach-object but this works:

gci |foreach-object{if (-not (select-string -inputobject $_ -Pattern "something")){$_}}