split a string to array of arrays properly

Question

I have a string that looks like:

const msg = " [['robot_arm', 'bc1', 'p_09_04_00'], ['operator', 'lc1', 'p_09_15_00'], ['robot_arm', 'oc1', 'p_08_17_00']]"

And I want to split it into an array of arrays of strings, I have tried to split this string as follows:

const msg_obj = new Array(JSON.parse(msg).split("["));
console.log(msg_obj);
for (let act_id in msg_obj) { 
    console.log(msg_obj[act_id]);
}

The problem is that I get unwanted characters/strings inside:

Empty strings "".
commas ,.
square bracket ].

Can you please tell me if there is a better way to split this string into an array of arrays of strings without the unwanted output? thanks in advance.

adiga · Accepted Answer · 2022-11-08 05:05:43Z

2

The problem is that your single quotes aren't valid JSON. You can easily get the result you want by replacing the quotes before parsing:

const msg = " [['robot_arm', 'bc1', 'p_09_04_00'], ['operator', 'lc1', 'p_09_15_00'], ['robot_arm', 'oc1', 'p_08_17_00']]"

const msg_obj = JSON.parse(msg.trim().replace(new RegExp("'", "g"), "\""));

console.log(msg_obj);
for (let act_id of msg_obj) {
  console.log(act_id);
}

edited Nov 8, 2022 at 5:05

adiga

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answered Nov 8, 2022 at 3:48

Benjamin Penney

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4 Comments

Bilal Over a year ago

I get an error:

Uncaught SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data at line 1 column 5 of the JSON data

Benjamin Penney Over a year ago

Please check my updated solution. I added the .trim() method to trim off excess whitespace. Are you sure that msg matches your real data?

Bilal Over a year ago

"msg matches your real data?", no, actually I have reduced the msg to make a MWE, thanks.

adiga Over a year ago

How do I create a runnable stack snippet?

hiwangyt · Accepted Answer · 2022-11-08 04:16:04Z

0

Your const msg is not a valid json string. maybe you can parse this string by this codes :

const msg = " [['robot_arm', 'bc1', 'p_09_04_00'], ['operator', 'lc1', 'p_09_15_00'], ['robot_arm', 'oc1', 'p_08_17_00']]"

msgArr = msg.split("], [").map(item => {  
    return item.trim().split(",").map(val => {
        return val.trim().replace(/\[|\'/g,'');  
    });  
})

example.png

edited Nov 8, 2022 at 4:16

answered Nov 8, 2022 at 4:09

hiwangyt

13 bronze badges

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