CODEWITHSUNDEEP
javascriptregexstring
Kanan Farzali
Kanan Farzali

Reputation: 1053

Getting substring from string separated with commas only

If I have a long string

8718584449,19630000,24,990,10218828289,840000,3,18,8914098889,2120000,4,108,8720551129,3690000,18,42

and I can get indexes of

8718584449, 10218828289, 8914098889, 8720551129

via the loop, how would I get sub-strings

19630000,24,990
840000,3,18
2120000,4,108
3690000,18,42

from that long string?

Basically, for every 4 numbers how dynamically to get the 2nd, the 3rd and the 4th numbers only if I know the first number of that 4-numbers substring? For instance, if I don't have 10218828289 then I don't want to get 840000,3,18

Upvotes: 1

Views: 758

Answers (1)

thomasd
thomasd

Reputation: 2612

You can use String.split, Array.slice, and Array.join to avoid regular expressions.

var s = '8718584449,19630000,24,990,10218828289,840000,3,18,8914098889,2120000,4,108,8720551129,3690000,18,42';
s.split(',').slice(1, 4).join(',');    // => '19630000,24,990'
s.split(',').slice(5, 8).join(',');    // => '840000,3,18'
s.split(',').slice(9, 12).join(',');   // => '19630000,24,990'
s.split(',').slice(13, 16).join(',');  // => '840000,3,18'

If, for whatever reason, you want to use regular expressions:

var s = '8718584449,19630000,24,990,10218828289,840000,3,18,8914098889,2120000,4,108,8720551129,3690000,18,42';
s.match(/\d+,((?:\d+,){2}(?:\d+))/g);  // => ['19630000,24,990', …]

Try it with RegEx101.

Upvotes: 4

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