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  $$text_ref =~ s|(?<="http://)(.*?)(?=["/])|$fixers{$1} ? $fixers{$1}
+ : $1|ge ;

  my $what = join('|', map(quotemeta, keys %fixers)) ;
  $$text_ref =~ s!(?<="http://)($what)(?=["/])!$fixers{$1}!ge ;