Question

使用Javascript。（注意有一个类似的post，但OP请求Java，这是用于Javascript ）

我试图在没有循环的情况下从整个字符串中删除单词列表（最好使用正则表达式）。

这是我到目前为止所做的，它删除了一些词，但不是全部。有人可以帮助确定我的RegEx功能出错吗？

＆＃13;

   //Remove all instances of the words in the array
  var removeUselessWords = function(txt) {

	var uselessWordsArray = 
        [
          "a", "at", "be", "can", "cant", "could", "couldnt", 
          "do", "does", "how", "i", "in", "is", "many", "much", "of", 
          "on", "or", "should", "shouldnt", "so", "such", "the", 
          "them", "they", "to", "us",  "we", "what", "who", "why", 
          "with", "wont", "would", "wouldnt", "you"
        ];
			
	var expStr = uselessWordsArray.join(" | ");
	return txt.replace(new RegExp(expStr, 'gi'), ' ');
  }

  var str = "The person is going on a walk in the park. The person told us to do what we need to do in the park";
  
  console.log(removeUselessWords(str));

//The result should be: "person going walk park. person told need park."

＆＃13;

Answer 1

三个时刻：

使用|加入没有旁边空格的数组项
将正则表达式替换组括在括号(...|...)
指定单词边界\b以匹配单独的单词

var removeUselessWords = function(txt) {
    var uselessWordsArray = 
        [
          "a", "at", "be", "can", "cant", "could", "couldnt", 
          "do", "does", "how", "i", "in", "is", "many", "much", "of", 
          "on", "or", "should", "shouldnt", "so", "such", "the", 
          "them", "they", "to", "us",  "we", "what", "who", "why", 
          "with", "wont", "would", "wouldnt", "you"
        ];
			
	  var expStr = uselessWordsArray.join("|");
	  return txt.replace(new RegExp('\\b(' + expStr + ')\\b', 'gi'), ' ')
                    .replace(/\s{2,}/g, ' ');
  }

var str = "The person is going on a walk in the park. The person told us to do what we need to do in the park";
  
console.log(removeUselessWords(str));

Answer 2

可能这就是你想要的：

   //Remove all instances of the words in the array
  var removeUselessWords = function(txt) {

	var uselessWordsArray = 
        [
          "a", "at", "be", "can", "cant", "could", "couldnt", 
          "do", "does", "how", "i", "in", "is", "many", "much", "of", 
          "on", "or", "should", "shouldnt", "so", "such", "the", 
          "them", "they", "to", "us",  "we", "what", "who", "why", 
          "with", "wont", "would", "wouldnt", "you"
        ];
			
	var expStr = uselessWordsArray.join("\\b|\\b");
	return txt.replace(new RegExp(expStr, 'gi'), '').trim().replace(/ +/g, ' ');
  }

  var str = "The person is going on a walk in the park. The person told us to do what we need to do in the park";
  
  console.log(removeUselessWords(str));

//The result should be: "person going walk park. person told need park."

Javascript RegEx从字符串

2 个答案: