[Solved] Undefined is not a function javascript error [closed]

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It’s getElementsByName note the s, document.getElementByName is not defined.

That would get you a nodeList, so

function cleaning() {
    var elem = document.getElementsByName("fitas")[0];

    elem.value = elem.value.replace(/^.+?(<url=[^>]+>).+$/, '$1');
}

Also, the way you’re typing the script tag was popupar in the nineties, these days it’s all lowercase, and you don’t need a language attribute, and in HTML5 you don’t really need a type attribute either.

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solved Undefined is not a function javascript error [closed]