gudn tach!
Wenn man Zeit hat, fällt einem schon so einiges ein. [...]
wie wahr, wie wahr.
http://selfhtml.apsel-mv.de/java-javascript/?modus=all&last=37
#!/usr/bin/perl  
use strict;  
use warnings;  
use File::Slurp qw(slurp);  
  
die "error: missing param: filename of large text file. \n" unless defined $ARGV[0];  
my $filename = $ARGV[0];  
my $filecontent = slurp $filename;  
my @words = sort keys {map {$_=>1} $filecontent=~/\b\p{L}++/g};  
my @grp = (shift @words);  
for my $w(@words, ''){  
  if(substr($w, 0, 3) eq substr($grp[0], 0, 3)){  
    push @grp, $w;  
  }else{  
    print "@grp\n" if @grp>1;  
    @grp = ($w);  
  }  
}
prost
seth