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$('#first_name,#last_name').keydown(function (e) { if (e.shiftKey || e.ctrlKey || e.altKey) { e.preventDefault(); } else { var key = e.keyCode; if (!((key == 8) || (key == 32) || (key == 9) || (key == 46) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) { e.preventDefault(); } } }); $('#username').keydown(function (e) { if (e.shiftKey || e.ctrlKey || e.altKey) { e.preventDefault(); } else { var key = e.keyCode; if (!((key == 8) || (key == 46) || (key == 9) || (key >= 35 && key <= 40) || (key >= 65 && key <= 90))) { e.preventDefault(); } } });