Simple alphanumeric space and underline and dash javascript validation

validateAlphanumeric.js

function validateField() {
    return{
         IsValidInput : function(input){
            var isValid = false;
            var validChars = /^[a-z\d\-_\s\/]+$/i;
            if (validChars.test(input)){ 
                isValid = true;
            }
            return isValid;
        }
    };
}

Simple function for javascript whitelist validation