Following the hint in
http://www.perlmonks.com/?node_id=564943,
I tried the following with map and grep:
use strict;
use Data::Dumper;
my ($hash, @array);
my @array = <DATA>;
$hash ={ map
{ chomp; my $key = (split(/\t/) )[0];
$key => [
grep {
chomp; $_
if( (split(/\t/) )[0] =~/$key/)
} @array
]
} @array
};
print Dumper(\%$hash);
__DATA__
1 2 a
1 13 w
1 20 c
2 1 b
2 40 n
3 30 a
Note: DATA should be tab delimited for this to work
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