相交文本以查找常用词 [英] Intersecting texts to find common words

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本文介绍了相交文本以查找常用词的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在试图找出哪一种是最佳的交叉方式,一组文本并在其中找到常用词。鉴于这种情况:

I'm trying to find out which would be the most optimal way of intersection a set of texts and find the common words in them. Given this scenario:

var t1 = 'My name is Mary-Ann, and I come from Kansas!';
var t2 = 'John, meet Mary, she comes from far away';
var t3 = 'Hi Mary-Ann, come here, nice to meet you!';

交叉口结果应为:

var result =["Mary"];

它应该能够忽略像。,!? - <的标点符号。 / code>

It should be able to ignore punctuation marks like .,!?-

正则表达式的解决方案是否最优?

Would a solution with regular expressions be optimal?

推荐答案

这是一个经过测试的解决方案:

Here's a tested solution :

function intersect() {
   var set = {};
   [].forEach.call(arguments, function(a,i){
     var tokens = a.match(/\w+/g);
     if (!i) {
       tokens.forEach(function(t){ set[t]=1 });
     } else {
       for (var k in set){
         if (tokens.indexOf(k)<0) delete set[k];
       }
     }
   });
   return Object.keys(set);
}

此函数是可变参数,您可以使用任意数量的文本调用它:

This function is variadic, you can call it with any number of texts :

console.log(intersect(t1, t2, t3)) // -> ["Mary"] 

console.log(intersect(t1, t2)) // -> ["Mary", "from"] 

console.log(intersect()) // -> [] 

如果你需要支持非英语语言,那么这个正则表达式是不够的,因为JavaScript正则表达式中对Unicode的不良支持。要么使用正则表达式库,要么明确定义正则表达式排除字符,如 a.match(/ [^ \\\\ - 。,!?] + / g); (这可能就足够了)。

If you need to support non English languages, then this regex won't be enough because of the poor support of Unicode in JavaScript regexes. Either you use a regex library or you define your regex by explicitly excluding characters as in a.match(/[^\s\-.,!?]+/g); (this will probably be enough for you) .

详细说明:

这个想法是用第一个文本的标记填充一个集合,然后从集合中删除其他文本中缺少的标记。

The idea is to fill a set with the tokens of the first text and then remove from the set the tokens missing in the other texts.


  1. 该集合是用作地图的JavaScript对象。一些纯粹主义者会使用 Object.create(null)来避免原型,我喜欢 {} 的简单性。

  2. 因为我希望我的功能是 variadic ,我使用 参数 而不是将传递的文本定义为显式参数。

  3. arguments 不是真正的数组,所以要迭代它你需要一个 for 循环或一个技巧,如 []。forEach.call 。它的工作原理是因为参数array-like

  4. 要标记化,我只需使用 匹配 以匹配单词,这里没什么特别的(请参阅上面关于更好地支持其他语言的说明)

  5. 我使用!i 来检查它是否是第一个文字。在这种情况下,我只需将标记复制为集合中的属性。必须使用一个值,我使用 1 。将来, ES6设置将使意图在这里变得更加明显。

  6. 对于以下文本,我迭代集合的元素(键)并删除那些不在数组中的元素令牌( tokens.indexOf(k)< 0

  7. 最后,我返回集合的元素,因为我们想要一个数组。最简单的解决方案是使用 Object.keys

  1. The set is a JavaScript object used as a map. Some purists would have used Object.create(null) to avoid a prototype, I like the simplicity of {}.
  2. As I want my function to be variadic, I use arguments instead of defining the passed texts as explicit arguments.
  3. arguments isn't a real array, so to iterate over it you need either a for loop or a trick like [].forEach.call. It works because arguments is "array-like".
  4. To tokenize, I simply use match to match words, nothing special here (see note above regarding better support of other languages, though)
  5. I use !i to check if it's the first text. In that case, I simply copy the tokens as properties in the set. A value must be used, I use 1. In the future, ES6 sets will make the intent more obvious here.
  6. For the following texts, I iterate over the elements of the sets (the keys) and I remove the ones which are not in the array of tokens (tokens.indexOf(k)<0)
  7. Finally, I return the elements of the sets because we want an array. The simplest solution is to use Object.keys.

这篇关于相交文本以查找常用词的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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