/* 
This script and many more are available free online at
The JavaScript Source :: http://javascript.internet.com
Created by: Travis Beckham :: http://www.squidfingers.com | http://www.podlob.com */

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//
// Coded by Travis Beckham
// http://www.squidfingers.com | http://www.podlob.com
// If want to use this code, feel free to do so, but
// please leave this message intact.
//
// |||||||||||||||||||||||||||||||||||||||||||||||||||||
// --- version date: 11/21/02 --------------------------

// returns true if the string is empty
function isEmpty(str) {
    return (str == null) || (str.length == 0);
}
// returns true if the string is a valid email
function isEmail(str) {
    if (isEmpty(str)) return false;
    var re = /^[^\s()<>@,;:\/]+@\w[\w\.-]+\.[a-z]{2,}$/i
    return re.test(str);
}
// returns true if the string only contains characters A-Z or a-z
function isAlpha(str) {
    var re = /[^a-zA-Z]/g
    if (re.test(str)) return false;
    return true;
}
// returns true if the string only contains characters 0-9
function isNumeric(str) {
    var re = /[\D]/g
    if (re.test(str)) return false;
    return true;
}
// returns true if the string only contains characters A-Z, a-z or 0-9
function isAlphaNumeric(str) {
    var re = /[^a-zA-Z0-9]/g
    if (re.test(str)) return false;
    return true;
}
// returns true if the string's length equals "len"
function isLength(str, len) {
    return str.length == len;
}
// returns true if the string's length is between "min" and "max"
function isLengthBetween(str, min, max) {
    return (str.length >= min) && (str.length <= max);
}
// returns true if the string is a US phone number formatted as...
// (000)000-0000, (000) 000-0000, 000-000-0000, 000.000.0000, 000 000 0000, 0000000000
function isPhoneNumber(str) {
    var re = /^\(?[2-9]\d{2}[\)\.-]?\s?\d{3}[\s\.-]?\d{4}$/
    return re.test(str);
}
// returns true if the string is a valid date formatted as...
// mm dd yyyy, mm/dd/yyyy, mm.dd.yyyy, mm-dd-yyyy
function isDate(str) {
    var re = /^(\d{1,2})[\s\.\/-](\d{1,2})[\s\.\/-](\d{4})$/
    if (!re.test(str)) return false;
    var result = str.match(re);
    var m = parseInt(result[1]);
    var d = parseInt(result[2]);
    var y = parseInt(result[3]);
    if (m < 1 || m > 12 || y < 1900 || y > 2100) return false;
    if (m == 2) {
        var days = ((y % 4) == 0) ? 29 : 28;
    } else if (m == 4 || m == 6 || m == 9 || m == 11) {
        var days = 30;
    } else {
        var days = 31;
    }
    return (d >= 1 && d <= days);
}
// returns true if "str1" is the same as the "str2"
function isMatch(str1, str2) {
    return str1 == str2;
}
// returns true if the string contains only whitespace
// cannot check a password type input for whitespace
function isWhitespace(str) { // NOT USED IN FORM VALIDATION
    var re = /[\S]/g
    if (re.test(str)) return false;
    return true;
}
// removes any whitespace from the string and returns the result
// the value of "replacement" will be used to replace the whitespace (optional)
function stripWhitespace(str, replacement) {// NOT USED IN FORM VALIDATION
    if (replacement == null) replacement = '';
    var result = str;
    var re = /\s/g
    if (str.search(re) != -1) {
        result = str.replace(re, replacement);
    }
    return result;
}