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  1. or download this
    #! perl
use strict;
...
   $yaml =~  s/\bFred\b/FRED/;
   $hash =   Load $yaml;
dd $hash;
  2. or download this
     0:26 >perl 1186_SoPW.pl
{ Barney => "FRED", Fred => "Wilma", Frederick => "Mary" }

 0:30 >
  3. or download this
    $yaml =~ s/(?<=\n)Fred(?=:)/FRED/g;