Javascript RegEx 从字符串中删除多个单词答案

【问题标题】：Javascript RegEx Remove Multiple words from stringJavascript RegEx 从字符串中删除多个单词
【发布时间】：2018-04-04 15:37:31
【问题描述】：

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

我正在尝试从整个字符串中删除单词列表而不进行循环（最好使用正则表达式）。

这是我目前所拥有的，它删除了一些单词，但不是全部。有人可以帮助确定我在使用 RegEx 函数时做错了什么吗？

   //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."

【问题讨论】：

首先去掉|周围的空白。
如果我这样做，那么该函数会删除所有字符而不是单词。（即：“walk”将是“wlk”）
@Jared Smith，我收回我上面的声明，因为 RomanPerekhrest 使用了你的评论。

标签： javascript regex string

【解决方案1】：

三个瞬间：

用| 连接数组项，不带空格
将正则表达式替换组括在括号中(...|...)
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));

【讨论】：

哇。这行得通。谢谢你。 \\b 意味着什么？
这样更好！
您还需要在所有这些末尾添加一个 .replace(/\s+\.(\s|$)/g, '.$1') 以清理句点之前的潜在空间。

【解决方案2】：

也许这就是你想要的：

   //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."

【讨论】：