如何识别正则表达式
这个问题在这里已经有了答案：
假设你想定位一个源（例如：一篇文章），并且想要检查哪个单词在该源中最常用：
假设文章中的整个文本块都在一个字符串中，分配给变量“str”：
// Will be used to track word counting
const arrWords = [];
// Target string
const str = 'fsdf this is the article fsdf we are targeting';
// We split each word in one array
const arrStr = str.trim().split(' ');
// Lets iterate over the words
const iterate = arrStr.forEach(word => {
// if a new word, lets track it by pushing to arrWords
if (!arrWords.includes(word)) {
arrWords.push({ word: word, count: 1 });
} else {
// if the word is being tracked, and we come across the same word, increase the property "count" by 1
const indexOfTrackedWord = arrWords.indexOf(word);
arrWords[indexOfTrackedWord].count++;
}
});
// Once that forEach function is done, you now have an array of objects that look like this for each word:
arrWords: [
{
word: 'fsdf',
count: 2
},
{
word: 'this',
count: 1
},
// etc etc for the other words in the string
];
现在你可以通过console.log（arrWords）来查看结果！
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