You could use regexp to extract names: 
my @files = (qw(
  hhk_1sss-(hello).txt
  hhk_2abc-(hello).txt
  hhk_3xyz-(hello).txt
));

my @new_files = map {
  /^.*_(\d[a-z]{3}).*(\.txt)$/; "$1$2"
} @files;

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In reply to Re: how to guess mutual frases? by arkturuz
in thread how to guess mutual frases? by Hossein

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