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YA Javascript Regex Question
A-z 0-9 - _ ' & .

/^[A-z0-9_]+(-)+$/i

/^[a-zA-Z0-9&_.-']+$/

<script type="text/javascript">
    //A-z 0-9 - _ ' & .
    //valid
    var test_string = "This'Is'-Val1d&_.";
    if (test_string.match(/^[a-zA-Z0-9&_.-']+$/)){
        alert("first test matched");
    }else{
        alert("first test did not match");
    }

    //invalid - whitespace not allowed
    test_string = "This IsNot- Va'l1d & _ .";
    if (test_string.match(/^[a-zA-Z0-9&_.-']+$/)){
        alert("second test matched");
    }else{
        alert("second test did not match");
    }

    //invalid - ! is not allowed
    test_string = "'ThisIsNotValid!'";
    if (test_string.match(/^[a-zA-Z0-9&_.-']+$/)){
        alert("third test matched");
    }else{
        alert("third test did not match");
    }

</script>

var regex = /^[a-z0-9_-.'&]/i;

/^[-w.'&]+$/