using System.Text.RegularExpressions; using System;
class Validation { public static void Main() { String strToTest; Validation objValidate=new Validation();
Console.Write("Enter a String to Test for Alphabets:"); strToTest=Console.ReadLine(); if(objValidate.IsAlpha(strToTest)) { Console.WriteLine("{0} is Valid Alpha String",strToTest); } else { Console.WriteLine("{0} is not a Valid Alpha String",strToTest); } }
// Function to test whether the string is valid number or not public bool IsNumber(String strNumber) { Regex objNotNumberPattern=new Regex("[^0-9.-]"); Regex objTwoDotPattern=new Regex("[0-9]*[.][0-9]*[.][0-9]*"); Regex objTwoMinusPattern=new Regex("[0-9]*[-][0-9]*[-][0-9]*"); String strValidRealPattern="^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+$"; String strValidIntegerPattern="^([-]|[0-9])[0-9]*$"; Regex objNumberPattern =new Regex("(" + strValidRealPattern +")|(" + strValidIntegerPattern + ")");