javascript – Regular expression that does not allow spaces at the end

Question:

I am working with this expression /^([a-zA-Z0-9]){1,16}$/ which validates a field that can only enter alphanumerics with a maximum length of 16 characters, but I need to add that it does not allow spaces at the end.

I've tried adding [:space:] or \s to the end and it doesn't work for me.

Who can guide me?

Kind regards

Answer:

As it is proposed, it does not allow spaces, neither before nor between nor after. Use the following template to test regexp

document.getElementById('dale').onclick = (ev) => {
  let exp = document.getElementById('laExpresion').value;
  let re = new RegExp(exp);
  console.log("/" + exp + "/", re.test(document.getElementById('elTexto').value));
}

Expresión: <input type="text" id="laExpresion" value="^([a-zA-Z0-9]){1,16}$" /><br />
Texto: <input type="text" id="elTexto" />
<button id="dale">validar</button>