String Validator

using System;
using System.Collections.Generic;
using System.Linq; /*** dotNet version ***/
using System.Text;

using System.Text.RegularExpressions;

/*
 * @Name:           ValidatorLib
 * @Description:    String validation
 * @Author:         Damjan Krstevski - SkyDriver
 * @Date:           20.11.2010
 * @License:        Freeware, you can use, edit, copy, redistribute...
 * @FeedBack:       krstevsky[at]gmail[dot]com
 */

namespace ValidatorLib
{
    /// <summary>
    /// Class for validation of the string
    /// </summary>
    class Validator
    {

        #region Class variable(s)
        /// <summary>
        /// Class value
        /// </summary>
        private string strText = string.Empty;
        #endregion


        #region Constructor(s)
        /// <summary>
        /// Default constructor
        /// </summary>
        public Validator()
        {

        }


        /// <summary>
        /// Other constructor with text value
        /// </summary>
        /// <param name="text">String, the string for validation</param>
        public Validator(string text)
        {
            this.strText = text;
        }
        #endregion


        #region SET and GET methods
        /// <summary>
        /// Set or Get the string value
        /// </summary>
        public string text
        {
            get { return this.strText; }
            set { this.strText = value; }
        }
        #endregion


        #region Function: isNullOrEmpty
        /// <summary>
        /// Check if the string is null or empty
        /// </summary>
        /// <returns>Bool, true if the string is null or empty</returns>
        public bool isNullOrEmpty()
        {
            return string.IsNullOrEmpty(this.strText);
        }


        /// <summary>
        /// Check if the string is null or empty
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <returns>Bool, true if the string is null or empty</returns>
        public bool isNullOrEmpty(string str)
        {
            return string.IsNullOrEmpty(str);
        }
        #endregion


        #region Function: Length validation
        /// <summary>
        /// Check string length (maximum length)
        /// </summary>
        /// <param name="maxLength">Int, the maximum allowed length</param>
        /// <returns>Bool, true if the string length is smallest or equal with the maximum allowed length</returns>
        public bool isLengthMax(int maxLength)
        {
            return this.strText.Length <= maxLength ? true : false;
        }


        /// <summary>
        /// Check string length (minimum length)
        /// </summary>
        /// <param name="minLength">Int, the minimum allowed length</param>
        /// <returns>Bool, true if the string length is biggest or equal with the minimum allowed length</returns>
        public bool isLengthMin(int minLength)
        {
            return this.strText.Length >= minLength ? true : false;
        }


        /// <summary>
        /// Check string length according given length range (minimum & maximum)
        /// </summary>
        /// <param name="min">Int, minimum allowed length</param>
        /// <param name="max">Int, maximum allowed length</param>
        /// <returns>Bool, true if the string length is between the given length range</returns>
        public bool isLength(int min, int max)
        {
            return this.strText.Length >= min && this.strText.Length <= max ? true : false;
        }


        /// <summary>
        /// Check the string length (maximum length)
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <param name="maxLength">Int, maximum allowed length</param>
        /// <returns>Bool, true if the string length is smallest or equal with the allowed length</returns>
        public bool isLengthMax(string str, int maxLength)
        {
            return str.Length <= maxLength ? true : false;
        }


        /// <summary>
        /// Check the string length (minimum length)
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <param name="minLength">Int, the minimum allowed length</param>
        /// <returns>Bool, true if the string length is biggest or equal with the allowed length</returns>
        public bool isLengthMin(string str, int minLength)
        {
            return str.Length >= minLength ? true : false;
        }


        /// <summary>
        /// Check the string length according given length range (minimum & maximum)
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <param name="min">Int, minimum allowed length</param>
        /// <param name="max">Int, maximum allowed length</param>
        /// <returns>Bool, true if the string length is between given length range</returns>
        public bool isLength(string str, int min, int max)
        {
            return str.Length >= min && str.Length <= max ? true : false;
        }
        #endregion


        #region Functions: is number, alpha, alpha-numeric...
        /// <summary>
        /// Check the string if is a number
        /// </summary>
        /// <returns>Bool, true if the string is a number</returns>
        public bool isNumber()
        {
            int tmp_n = 0;
            return int.TryParse(this.strText, out tmp_n);
        }


        /// <summary>
        /// Check if the string contains only alpha character(s)
        /// </summary>
        /// <returns>Bool, true if the string contains only alpha characters</returns>
        public bool isAlpha()
        {
            Regex r = new Regex(@"[^a-zA-Z]");
            return !r.IsMatch(this.strText);
        }


        /// <summary>
        /// Check if the string contains only alpha character(s)
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <returns>Bool, true if the string contains only alpha characters</returns>
        public bool isAlpha(string str)
        {
            Regex r = new Regex(@"[^a-zA-Z]");
            return !r.IsMatch(str);
        }


        /// <summary>
        /// Check if the string contains only alpha-numeric characters
        /// </summary>
        /// <returns>Bool, true if the string contains only alpha-numeric characters</returns>
        public bool isAlphaNumeric()
        {
            Regex r = new Regex(@"[^a-zA-Z0-9]");
            return !r.IsMatch(this.strText); 
        }


        /// <summary>
        /// Check if the string contains only alpha-numeric characters
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <returns>Bool, if the string contains only alpha-numeric characters</returns>
        public bool isAlphaNumeric(string str)
        {
            Regex r = new Regex(@"[^a-zA-Z0-9]");
            return !r.IsMatch(str);
        }
        #endregion


        #region Function: Mail validation
        /// <summary>
        /// Check if the mail is valid
        /// </summary>
        /// <returns>Bool, true if the mail address is valid</returns>
        public bool isMailValid()
        {
            string pattern = @"^[-a-zA-Z0-9][-.a-zA-Z0-9]*@[-.a-zA-Z0-9]+(\.[-.a-zA-Z0-9]+)*\.
                (com|edu|info|gov|int|mil|net|org|biz|name|museum|coop|aero|pro|tv|[a-zA-Z]{2})$";
            Regex r = new Regex(pattern, RegexOptions.IgnorePatternWhitespace);
            return r.IsMatch(this.strText);
        }


        /// <summary>
        /// Check if the mail is valid
        /// </summary>
        /// <param name="mail">String, the mail address for validation</param>
        /// <returns>Bool, true if the mail address is valid</returns>
        public bool isMailValid(string mail)
        {
            string pattern = @"^[-a-zA-Z0-9][-.a-zA-Z0-9]*@[-.a-zA-Z0-9]+(\.[-.a-zA-Z0-9]+)*\.
                (com|edu|info|gov|int|mil|net|org|biz|name|museum|coop|aero|pro|tv|[a-zA-Z]{2})$";
            Regex check = new Regex(pattern, RegexOptions.IgnorePatternWhitespace);
            return check.IsMatch(mail);
        }
        #endregion


        #region Functions: is lower, upper...
        /// <summary>
        /// Check if the string contains only lower characters
        /// </summary>
        /// <returns>Bool, true if the string contains only lower charaters</returns>
        public bool isLower()
        {
            Regex r = new Regex(@"[^a-z]$");
            return !r.IsMatch(this.strText);
        }


        /// <summary>
        /// Check if the string contains only lower characters
        /// </summary>
        /// <param name="str">String, string for validation</param>
        /// <returns>Bool, true if the string contains only lower charaters</returns>
        public bool isLower(string str)
        {
            Regex r = new Regex(@"[^a-z]$");
            return !r.IsMatch(str);
        }


        /// <summary>
        /// Check if the string contains only upper characters
        /// </summary>
        /// <returns>Bool, true if the string contains only upper characters</returns>
        public bool isUpper()
        {
            Regex r = new Regex(@"[^A-Z]$");
            return !r.IsMatch(this.strText);
        }


        /// <summary>
        /// Check if the string contains only upper characters
        /// </summary>
        /// <param name="str">String, the string for validation</param>
        /// <returns>Bool, true if the string contains only upper characters</returns>
        public bool isUpper(string str)
        {
            Regex r = new Regex(@"[^A-Z]$");
            return !r.IsMatch(str);
        }
        #endregion


    }
}