How to make input validation so that only numbers and (! One) dot or comma would be?

Question

JavaScript

Help refine the regular expression so that using JS and RegExp (probably) to validate the input field so that only numbers or one dot or one comma are entered.
(if there is a semicolon it can't be vice versa)

Here's my solution so far:

<input id = "#inputIn" />
<button id = "#checkIt" >check</button>
<script type = "text/javascript">

document.getElementById("#checkIt").onclick = function () {
    alert(/^\s*[\d]+(?:,[\d]+)?\s*$/.test(document.getElementById("#inputIn").value) );
}

</script>

and link to jsfiddle:
jsfiddle.net/_jack/bgs7n895/7/

Answer 1

/^\s*[\d]+([,\.][\d]+)?\s*$/