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  1. or download this
    #!/usr/bin/perl -w
use strict;
...
  2. or download this
    input='a b \ c d'
myvar='ab\cd'
better='ab\cd'
  3. or download this
     $var = "bla[abc]\\t";  # $var contains bla[abc]\t
 /$var/;      # is equivalent to /bla[abc]\t/
 /\Q$var\E/;  # is equivalent to /bla\[abc\]\\t/