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

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    I have this:

    var str = A123B234C456;

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

    A,123,B,234,c,456

    I thought a regular expression would be best for this, but I keep getting stuck. Essentially, I tried to do a string replace, but you cannot use a regular expression in the second argument.

    I would love to keep it simple and clean and do something like this, but it does not work:

    str = str.replace(/[\d]+/, ","+/[\d]+/);

    But in the real world that would be too simple.

    Is it possible?

    I have this:

    var str = A123B234C456;

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

    A,123,B,234,c,456

    I thought a regular expression would be best for this, but I keep getting stuck. Essentially, I tried to do a string replace, but you cannot use a regular expression in the second argument.

    I would love to keep it simple and clean and do something like this, but it does not work:

    str = str.replace(/[\d]+/, ","+/[\d]+/);

    But in the real world that would be too simple.

    Is it possible?

    • javascript
    • string
    • split
    • chunks
    Share Improve this question edited Aug 19, 2020 at 11:23 Peter Mortensen 31.6k22 gold badges110 silver badges133 bronze badges asked May 19, 2011 at 14:36 PaulPaul 1,5552 gold badges16 silver badges26 bronze badges
    Add a ment  | 

    3 Answers 3

    Reset to default 7

    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';

    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"

    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'.

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