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Javascript – What's the regex pattern that comma separates a number's integer part every 3 digits and not the decimal part?

I’m looking for a regex pattern that given 1234, returns 1,234 and given 1234.1234, returns 1,234.1234.

I’m using JavaScript and am using this pattern for an input on the website with real-time data entry.

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2

Answers


  1. 0
    1. Split based on the dot if exists.
    2. Introduce commas.
    3. Join back.
    function formatNumber(num) {
    var parts = num.toString().split(".");
    parts[0] = parts[0].replace(/B(?=(d{3})+(?!d))/g, ",");
    return parts.join(".");
}
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  2. 0

    You can use a regexp

    const formatNumber = num => num.toString().replace(/(?<!..*)B(?=(d{3})+(?!d))/g, ",");

[1234.1234, 1234, 123.4, 322124234.2].forEach(num => console.log(formatNumber(num)));
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