unable to remove invisible characters with perl

I have a file with special characters that I would like to replace.

I found the regex to detect it but I am not able to replace it, am I doing something wrong here?

use feature qw(say);

# 	Detect non-printable characters with POSIX expression
my $inv_rex = qr/[^[:print:]]/;
my $inv_rex_s = s/[^[:print:]]//;
my $matched = 0;

while (my $line = <>) {
     chomp $line;
     @fields =  split / /, $line;
     # Check each field
     foreach my $field (@fields) {
     	next unless $field =~ $inv_rex;
     	$field =~ $inv_rex_s;

say "\n $matched fields with non-printable characters detected";

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D:\scripts\>cat -vet  d:\temp\foo.txt
M-oM-;M-?A mdmaaa.example.comM-BM- ^M$
A mytssd.example.comM-BM- ^M$
A netfwcc.example.comM-BM- ^M$
A nj6bfvv.example.comM-BM- ^M$
A njovvv.example.comM-BM- ^M$
A njtfff4.example.comM-BM- ^M$
A oiddd.example.comM-BM- ^M$
A ovdlll.example.comM-BM-

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use feature qw(say);
my $inv_rex = qr/[^[:print:]]/;
my $matched = 0;
while( <> ){
    m/$inv_rex/ && ++$matched for split ;
say "\n $matched fields with non-printable characters detected";

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MazdajaiAuthor Commented:
I missed the qr.... Thanks ozo!
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