将数组的字符串转换为数组js

Question

Why cant i convert this arr

let stringarr = "[2022/07/12, 2022/08/09]"

to this arr

let arr = JSON.parse(stringarr) ---> error

Unexpected token / in JSON at position 5

Answer 1

It's not valid JSON, since the array elements aren't quoted.

If the array elements are all dates formatted like that, you could use a regular expression to extract them.

 let stringarr = "[2022/07/12, 2022/08/09]" let dates = stringarr.match(/\d{4}\/\d{2}\/\d{2}/g); console.log(dates);

Answer 2

what can i do then to convert it to an array

There are several ways to do that, if the format of the string stays like this. Here's an idea.

 console.log(`[2022/07/12, 2022/08/09]` .slice(1, -1) .split(`, `));

Or edit to create a valid JSON string:

 const dateArray = JSON.parse( `[2022/07/12, 2022/08/09]` .replace(/\[/, `["`) .replace(/\]/, `"]`) .replace(/, /g, `", "`)); console.log(dateArray);

Or indeed use the match method @Barmar supplied.

Answer 3

It's to much simple 😄.

As your input is a valid array in string format. So, remove [ ] brackets and split with comma (,). Then it automatically generates an array.

let stringarr = "[2022/07/12, 2022/08/09]";
let arr = stringarr.replace(/(\[|\])/g, '').split(',');

Output:

['2022/07/12', ' 2022/08/09']

Answer 4

 const regexp = /\d+\/\d+\/\d+/g; const stringarr = "[2022/07/12, 2022/08/09]"; const arr = [...stringarr.matchAll(regexp)]; console.log(arr)