grep -v in Perl one-line

How to create the grep -v command in Perl, here is the clue :

[pene@donunix] perl -ne "! /your_string/ && print" file.txt

And if you want to write the output directly into the input file (file.txt), just type this :
[pene@donunix] perl -i.bak -ne "! /your_string/ && print" file.txt