You could use the substr method to get the first 3 letters and use a hash of arrays to store the matching strings. While probably not the most efficient, the following might be a good place for you to start:
#!/usr/bin/perl
use strict;
use Data::Dumper;
my (@words, $substr, %hash);
@words = qw/sem sema cat semok hgt cato seme cate/;
foreach (@words) {
$substr = substr( $_, 0, 3 );
push( @{ $hash{$substr} }, $_ );
}
print Dumper(\%hash);
exit;
$VAR1 = {
'cat' => [
'cat',
'cato',
'cate'
],
'sem' => [
'sem',
'sema',
'semok',
'seme'
],
'hgt' => [
'hgt'
]
};
hope this helps,
davidj
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