Javascript：在字符串中查找单词 [英] Javascript: find word in string

问题描述

Javascript是否有内置函数来查看字符串中是否存在单词？我不是在寻找类似 indexOf（）的东西，而是：

Does Javascript have a built-in function to see if a word is present in a string? I'm not looking for something like indexOf(), but rather:

find_word('test', 'this is a test.') -> true
find_word('test', 'this is a test') -> true
find_word('test', 'I am testing this out') -> false
find_word('test', 'test this out please') -> true
find_word('test', 'attest to that if you would') -> false

基本上，我想知道我的单词是否出现，但不是另一个单词的一部分。手动实现起来并不难，但我想我会问是否已经有这样的内置函数，因为看起来它会出现很多东西。

Essentially, I'd like to know if my word appears, but not as part of another word. It wouldn't be too hard to implement manually, but I figured I'd ask to see if there's already a built-in function like this, since it seems like it'd be something that comes up a lot.

推荐答案

您可以使用拆分和一些：

function findWord(word, str) {
  return str.split(' ').some(function(w){return w === word})
}

或使用带有单词边界的正则表达式：

Or use a regex with word boundaries:

function findWord(word, str) {
  return RegExp('\\b'+ word +'\\b').test(str)
}

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