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  1. or download this
    #!/usr/bin/env perl

...
$var =~ s/\Q$search/$replace/;

print "\$var[$var]\n";
  2. or download this
    ken@titan ~/tmp
$ perl -v
...
ken@titan ~/tmp
$ ./pm_11152209_re_backslashes.pl
$var[\KeepMe]
  3. or download this
    C:\cygwin64\home\ken\tmp>perl -v

...

C:\cygwin64\home\ken\tmp>perl pm_11152209_re_backslashes.pl
$var[\KeepMe]