@array2 = grep {$_ =~ "n"} @array; is usually written as @array2 = grep /n/, @array; and if you want to use that in an "if" statement:

if ( grep /n/, @array ) {
    print "\@array has some elements that contain 'n'.\n";
    }
else {
    print "\@array does not have 'n' in any elements.\n";
    }
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