假设我有一段文字:
$body = 'the quick brown fox jumps over the lazy dog';
我想把那个句子变成“关键字”的散列,但我想允许多字关键字;我有以下获取单个单词的关键字:
$words{$_}++ for $body =~ m/(\w+)/g;
完成后,我有一个如下所示的哈希:
'the' => 2,
'quick' => 1,
'brown' => 1,
'fox' => 1,
'jumps' => 1,
'over' => 1,
'lazy' => 1,
'dog' => 1
下一步,以便我可以获得 2 个单词的关键字,如下所示:
$words{$_}++ for $body =~ m/(\w+ \w+)/g;
但这只会得到每个“其他”对;看起来像这样:
'the quick' => 1,
'brown fox' => 1,
'jumps over' => 1,
'the lazy' => 1
我还需要一个词的偏移量:
'quick brown' => 1,
'fox jumps' => 1,
'over the' => 1
有比以下更简单的方法吗?
my $orig_body = $body;
# single word keywords
$words{$_}++ for $body =~ m/(\w+)/g;
# double word keywords
$words{$_}++ for $body =~ m/(\w+ \w+)/g;
$body =~ s/^(\w+)//;
$words{$_}++ for $body =~ m/(\w+ \w+)/g;
$body = $orig_body;
# triple word keywords
$words{$_}++ for $body =~ m/(\w+ \w+ \w+)/g;
$body =~ s/^(\w+)//;
$words{$_}++ for $body =~ m/(\w+ \w+ \w+)/g;
$body = $orig_body;
$body =~ s/^(\w+ \w+)//;
$words{$_}++ for $body =~ m/(\w+ \w+ \w+)/g;