Twitter Bootstrap Alert Controller

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-combined.min.css">
<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js"></script>
<div class="container">
    <form action="javascript:;" method="post" class="form-inline" id="form">
        <input type="text" id="message" class="input-medium" placeholder="Message" />
   
        <button type="button" class="btn" data-action="insert">Show</button>

    </form>
</div>

JavaScript

var onloading = (function () {
        
            $('body').on('click', ':button', function () {
                var a = document.getElementById("message").value;
                var hasS = new RegExp("^[a-zA-Z]$").test(a);
                var b = a.replace(/[^0-9.-]/g, '').replace(/(\..*)\./g, '$1').replace(/(?!^)-/g, '');
                alert(b)
            });
        
    }());