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How To Find A Htmltag In A String Using Jquery/javascript?

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I have a text area in a page. If user try to give some html tags as a input and submit then i need to throw an error. How can i get this done using jquery/javascript? Could anyone

Solution 1:

Reply given in the above comment is not considering below html tags.

<html>,<body> and <head>

So this is how i implemented the requirement and it is working fine.

var textboxValue = document.getElementById("textbox").value;
var nonHtmlValue = textboxValue.replace(/<[^>]+>/g, '');
if(textboxValue!=nonHtmlValue)
{
    alert("HTML is not allowed");
}

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