Simple validation and typing functions

validation.js

exports.trim = function(s) {
  //alert('hi');
	var l = 0;
	var r = s.length - 1;
	while (l < s.length && s[l] == ' ') {
		l++;
	}
	while (r > l && s[r] == ' ') {
		r -= 1;
	}
	return s.substring(l, r + 1);
};

exports.validateEmail = function(value, alerts){
  var success;
	var message = "";
	var tfld = exports.trim(value);
	var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    if (value === "") {
        message = "You didn't enter an email address.";
        success=false;
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        message = "Please enter a valid email address.";
        success=false;
    } else if (value.match(illegalChars)) {
        message = "The email address contains illegal characters.";
        success=false;
    } else {
    	success = true;
    }
    if (alerts && !success){
    	alert(message);
    }
    return success;
}

exports.validatePhone = function(value, alerts){
  var success;
	var message = '';
    var stripped = value.replace(/[\(\)\.\-\ ]/g, '');
    if (value === "") {
        message = "You didn't enter a phone number.";
        success = false;
    } else if (isNaN(stripped)){
        message = "The phone number contains illegal characters.";
        success = false;
    } else if (!(stripped.length == 10)){
        message = "The phone number is the wrong length. Make sure you included an area code.";
        success = false;
    } else {
    	success = true;
    }
    if (alerts && !success){
    	alert(message);
    }
    return success;
}

exports.phoneOrEmail = function(value){
  var phone = exports.validatePhone(value, false);
	var email = exports.validateEmail(value, false);
	var type;
	if (phone){
		type = 'phone';
	} else if (email){
		type = 'email';
	} else {
		type = 'none';
	}

	return type;
}