JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="g-text"></textarea>

JavaScript

$(document).ready(function () {
    
    $('#g-text').keyup(function() {
        var $th = $(this);
        $th.val( $th.val().replace('a href', function(str) { alert('You typed " ' + str + ' ".\n\nPlease do not use that.'); return ''; } ) );
    });
});