Javascript：在字符串中查找单词
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Javascript: find word in string
提问by Mala
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:
Javascript 是否有内置函数来查看字符串中是否存在某个单词？我不是在寻找类似的东西indexOf()，而是：
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
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.
本质上，我想知道我的词是否出现，而不是作为另一个词的一部分。手动实现不会太难，但我想我会问一下是否已经有这样的内置函数，因为它似乎会出现很多。
回答by elclanrs
You can use splitand some:
您可以使用split和some：
function findWord(word, str) {
return str.split(' ').some(function(w){return w === word})
}
Or use a regex with word boundaries:
或者使用带有单词边界的正则表达式：
function findWord(word, str) {
return RegExp('\b'+ word +'\b').test(str)
}
回答by Jeff Clayton
No there is not a built in function for this. You will have to add programming such as a regex or split() it by whitespace then compare the result == 'test'.
不，没有为此内置功能。您必须通过空格添加诸如正则表达式或 split() 之类的程序，然后比较结果 == 'test'。
