get a "from" date and "to" date from a string

var string = '1: Mode: SOME Date range: 01/01/2018-31/12/2018 User: HANS'

I would like to get a date from the above string, remove all the other content and return like the below:

['2018-01-01', '2018-12-31', '201801', '201812']

Basically, YYYY-MM-DD, YYYY-MM-DD, YYYMM, YYYYMM.

I have tried the following but couldn’t progress more:

var res = string.match(/\d{2}([\/.-])\d{2}\1\d{4}/g);

=> ['01/01/2018', '31/12/2018']

Then another function is to get the YYYYMM part.

var arr = res[0].split("-");
return arr[0]+arr[1];
=> '201801'

Is it possible to get the four elements in a single array in an efficient way?

Thanks in advance!

>Solution :

I would do it in two steps. Find the dates, then format them.

const formatDateParts = (string) => {
    const [day, month, year] = string.split('/');
    return [[year, month, day].join('-'), `${year}${day}`];
};

const [_, date1, date2] = string.match(/(\d{2}\/\d{2}\/\d{4})-(\d{2}\/\d{2}\/\d{4})/);

const [date1Format, date1Condensed] = formatDateParts(date1);
const [date2Format, date2Condensed] = formatDateParts(date2);

const result = [date1Format, date2Format, date1Condensed, date2Condensed];