open IN,"$_" or die "Could not read file\n" ;

local $/ ;
my $file = <IN> ; # read file
close IN ;

$file =~ s/$ARGV[1]/$ARGV[2]/g ;

##</code><code>##

Malformed UTF-8 character (unexpected non-continuation byte 0x20, immediately after start byte 0xe9) in substitution iterator at ./myscript.pl line 23