Splitting a string into chunks by numeric or alpha character with JavaScript

Question

I have this:

var str = A123B234C456;

I need to split it into comma-separated chunks to return something like this:

A,123,B,234         


        

Answer 1

The string split method can be called with a regular expression.

If the regular expression has a capture group, the separator will be kept in the resulting array.

So here you go:

let c = "A123B234C456";
let stringsAndNumbers = c.split(/(\d+)/); // ["A", "123", "B", "234", "C", "456", ""]

Since your example ends with numbers, the last element will be empty. Remove empty array elements:

let stringsAndNumbers = c.split(/(\d+)/).filter(el => el != ""); // ["A", "123", "B", "234", "C", "456"]

Then join:

let stringsAndNumbers = c.split(/(\d+)/).filter(el => el != "").join(","); // "A,123,B,234,C,456"

Answer 2

You can do it by replace() using a regular expression.

For example,

var str = "A123B234C456";
str = str.replace(/([a-bA-B])/g, '$1,');

Now the value of str will be 'A,123,B234,C456'.

Answer 3

It may be more sensible to match the characters and then join them:

str = str.match(/(\d+|[^\d]+)/g).join(',');

But don't omit the quotes when you define the string:

var str = 'A123B234C456';