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  1. or download this
     If no string is specified via the =~ or !~ operator, the $_ string is
+ transliterated.
  2. or download this
    C:\test>perl -wle"$_ = 'aaa'; print $_ !~ tr[a][]"

...
C:\test>perl -wle"$_ = 'aaa'; print $_ !~ tr[bc][]"
1
C:\test>perl -wle"$_ = 'aab'; print $_ !~ tr[bc][]"
  3. or download this
    perl -wle"$_ = 'aaa'; $_ !~ tr[a][]d; print"