How to split one string including it in the array javascript?

Question

Let's say we have the following strings:

const str1 = 'aabbcc';
const str2 = 'aabbccaaddaaaaeeff';

I need to split them in order to obtain the following result:

mySplitFunction(str1, 'aa')//<--- ['aa','bbcc']
mySplitFunction(str1, 'bb')//<--- ['aa','bb', 'cc']
mySplitFunction(str2, 'aa')//<--- ['aa','bbcc', 'aa','dd', 'aa','aa', 'eeff']
mySplitFunction(str2, 'dd')//<--- ['aabbccaa','dd', 'aaaaeeff']

How would you do it?

Consider this answer: [Javascript and regex: split string and keep the separator](https://stackoverflow.com/questions/12001953/javascript-and-regex-split-string-and-keep-the-separator) — Wyck, Nov 14 '21 at 18:10
`const mySplitFunction = (str, splitter) => str.split(new RegExp(\`(${escapeForRegExp(splitter)})\`).filter(s => s)` — ASDFGerte, Nov 14 '21 at 18:13
GG for the ones that thought I was asking for a simple split — Loudrous, Nov 14 '21 at 18:15

Spectric · Answer 1 · 2021-11-14T18:14:10.250

2

Try:

const str1 = 'aabbcc';
const str2 = 'aabbccaaddaaaaeeff';
function mySplitFunction(str, delimiter){
  return str.split(new RegExp(`(${delimiter})`)).filter(s => s)
}

console.log(mySplitFunction(str1, 'aa'))
console.log(mySplitFunction(str1, 'bb'))
console.log(mySplitFunction(str2, 'aa'))
console.log(mySplitFunction(str2, 'dd'))

edited Nov 14 '21 at 18:14

answered Nov 14 '21 at 18:07

Spectric

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score 2 · Accepted Answer · answered Nov 14 '21 at 18:13

You could take the separator in parenteses and filter the result to omit empty strings.

const
    split = (string, separator) => string
        .split(new RegExp(`(${separator})`))
        .filter(Boolean),
    str1 = 'aabbcc',
    str2 = 'aabbccaaddaaaaeeff';

console.log(...split(str1, 'aa')); // ['aa','bbcc']
console.log(...split(str1, 'bb')); // ['aa','bb', 'cc']
console.log(...split(str2, 'aa')); // ['aa','bbcc', 'aa','dd', 'aa','aa', 'eeff']
console.log(...split(str2, 'dd')); // ['aabbccaa','dd', 'aaaaeeff']

How to split one string including it in the array javascript?

2 Answers2