Javascript在字符串中找到单词的索引（不是单词的一部分） [英] Javascript find index of word in string (not part of word)

问题描述

我目前正在使用 str.indexOf（word）来查找字符串中的单词。
但问题在于它还会返回其他单词的部分内容。

I am currently using str.indexOf("word") to find a word in a string. But the problem is that it is also returning parts of other words.

示例：我去了foobar并订购了foo。
我想要单词foo的第一个索引，而不是foobar中的foo。

Example: "I went to the foobar and ordered foo." I want the first index of the single word "foo", not not the foo within foobar.

我无法搜索foo因为有时它可能后跟一个句号或逗号（任何非字母数字字符）。

I can not search for "foo " because sometimes it might be followed by a full-stop or comma (any non-alphanumeric character).

推荐答案

你必须使用正则表达式为此：

You'll have to use regex for this:

> 'I went to the foobar and ordered foo.'.indexOf('foo')
14
> 'I went to the foobar and ordered foo.'.search(/\bfoo\b/)
33

/ \\\ bfoo \b / 匹配由字边界包围的 foo 。

/\bfoo\b/ matches foo that is surrounded by word boundaries.

要匹配任意单词，请构建一个 RegExp 对象：

To match an arbitrary word, construct a RegExp object:

> var word = 'foo';
> var regex = new RegExp('\\b' + word + '\\b');
> 'I went to the foobar and ordered foo.'.search(regex);
33

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