Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var addresses = ['test@test.test', 'test.test@test', 'test@test@test.test', '@test.etst', 't@est.test'];
    
    var regex = new RegExp(/^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$/);
    
    var whitespace = " \t\n\r";
    
    function charAtMethod(s)
    {
        if (isEmpty(s)) return false;
    
        if (isWhitespace(s)) return false;
    
        var i = 1;
        var sLength = s.length;
    
        while ((i < sLength) && (s.charAt(i) != "@"))
        { i++
        }
    
        if ((i >= sLength) || (s.charAt(i) != "@")) return false;
        else i += 2;
    
        while ((i < sLength) && (s.charAt(i) != "."))
        { i++
        }
        if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
        else return true;
    }
    
    function isEmpty(s)
    {
        return ((s == null) || (s.length == 0))
    }
    
    function isWhitespace(s)
    {
        var i;
    
        if (isEmpty(s)) return true;
        for (i = 0; i < s.length; i++)
        {
            // Check that current character isn't whitespace.
            var c = s.charAt(i);
    
            if (whitespace.indexOf(c) == -1) return false;
        }
        return true;
    }
    
  };
</script>

Test runner

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for (var x in addresses) {
  regex.test(addresses[x]);
}

for (var x in addresses) {
  charAtMethod(addresses[x]);
}

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by rlemon on 11th April 2012
• Revision 2: published on 11th April 2012
• Revision 3: published on 7th February 2013

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