Question 235569 in Jquery Question posted in
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Jquery – Get specific index of input array elements

I have a form with input fields like this:

lines[1][config][options][346]

I can get the last part with this:

var name = 'lines[0][config][options][343]';
let ido = name.lastIndexOf("["),
  idc = name.lastIndexOf("]"),
  index = name.substring(ido + 1, idc);
console.log(index);

But what if i am interested in first, second, third etc. name?

Tags:

3

Answers


  1. 0

    js regular expression solution

    const str = 'lines[0][config][options][343]';
const reg = /[([0-9]+|[a-z]+|[A-Z]+)]/g;
const groups = [];

str.replaceAll(reg, group => {
  let value = group.replace(`[`, ``).replace(`]`, ``)
  groups.push(value)
  return ''
});

console.log(`groups =`, groups);
// ['0', 'config', 'options', '343']

// one more thing ✅
const arr = groups.map(item => isNaN(item) ? item : parseInt(item))
console.log(`arr =`, arr);
// [0, 'config', 'options', 343]
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  2. 0

    Use a simple regular expression:

    const input = `lines[1][config][options][346]`;
const values = input.match(/(?<=[)[^]]+(?=])/g);

console.log(values);    // ["1", "config", "options", "346"]
console.log(values[1]); // "config"

    here’s explained on Regex101.com, basically:

    expression description
    (?<=[) (positive lookbehind) Preceded by [
    [^]]+ not ] one or more times
    (?=]) (positive lookahead) followed by ]
    g (Global match flag)
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