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html - Split string at space after certain number of characters in Javascript

I am attempting to create a tool that takes an input text and splits it into chunks of text at a certain # of characters. However, I need to make sure it does not split the text in the middle of a word.

In my case, I am splitting the string after 155 characters.

I've done quite a lot of searching to try and find a solution, but I fear it may be more complicated than my knowledge of Javascript allows me to figure out. I believe I just need to make some sort of logic that has the splitter backtrack to a space to split if it is in the middle of a word, but I am not sure how to write out such a thing.

Here is my javascript code at the moment:

function splitText() {
    "use strict";
    var str = document.getElementById("user_input").value;
    var size = 195;
    var chunks = new Array(Math.ceil(str.length / size)),
        nChunks = chunks.length;

    var newo = 0;
    for (var i = 0, o = 0; i < nChunks; ++i, o = newo) {
          newo += size;
          chunks[i] = str.substr(o, size);
    }

    var newq = 0;
    for (var x = 0, q = 0; x < nChunks; ++x, q = newq) {
        $("#display").append("<textarea readonly>" + chunks[x] + "</textarea><br/>");
    }
}

And here is my HTML:

<body>
    <content>
        <h1>Text Splitter</h1>
        <form>
            <label>Enter a Message</label>
            <input type="text" name="message" id="user_input">
        </form>
        <form>
            <input type="button" onclick="splitText();" id="submit" value="Submit!"> <br/>
        </form>
        <label>Your split message: </label>
        <p><span id='display'></span></p>
    </content>
</body>

Here is the code in its current working form, if you'd like to take a look: https://jsfiddle.net/add4s7rs/7/

Thank you! I appreciate any assistance!

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1 Answer

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A short and simple way to split a string into chunks up to a certain length using a regexp:

const chunks = str.match(/.{1,154}(s|$)/g);

some examples:

const str = 'the quick brown fox jumps over the lazy dog';

console.log(str.match(/.{1,10}(s|$)/g))
console.log(str.match(/.{1,15}(s|$)/g))

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