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Editorial Team
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Asked: 2026-05-30T16:35:00+00:00

i need to remove all tags except a list of allowed tags from a

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i need to remove all tags except a list of allowed tags from a string. I must use regex in javascript.

So if i have in my string :

<html>
    <b>my text</b> is just <strong>an example</strong>
</html>

and my list of allowed tags is : b, strong

the result must be :

<b>my text</b> is just <strong>an example</strong>

Seems to be simple, but regex are getting me out of me 🙂

Thanks a lot dear friends !

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1 Answer

  1. Editorial Team

    I just looked this up on phpjs.org: http://phpjs.org/functions/strip_tags:535

    function strip_tags (input, allowed) {
    allowed = (((allowed || "") + "").toLowerCase().match(/<[a-z][a-z0-9]*>/g) || []).join(''); // making sure the allowed arg is a string containing only tags in lowercase (<a><b><c>)
    var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>/gi,
        commentsAndPhpTags = /<!--[\s\S]*?-->|<\?(?:php)?[\s\S]*?\?>/gi;
    return input.replace(commentsAndPhpTags, '').replace(tags, function ($0, $1) {
        return allowed.indexOf('<' + $1.toLowerCase() + '>') > -1 ? $0 : '';
    });
}

    NOT my code, but it will do as you ask – strip tags with exceptions you specify.

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