using System.Text.RegularExpressions; class Class1 { /**////<summary> /// 应用程序的主入口点。 ///</summary> [STAThread] staticvoid Main(string[] args) { // // TODO: 在此处添加代码以启动应用程序 // String strToTest; Class1 objValidate=new Class1(); 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 for Positive Integers.(正整数) publicbool IsNaturalNumber(String strNumber) { Regex objNotNaturalPattern=new Regex("[^0-9]"); Regex objNaturalPattern=new Regex("0*[1-9][0-9]*"); return!objNotNaturalPattern.IsMatch(strNumber) && objNaturalPattern.IsMatch(strNumber); } // Function to test for Positive Integers with zero inclusive(非负整数) publicbool IsWholeNumber(String strNumber) { Regex objNotWholePattern=new Regex("[^0-9]"); return!objNotWholePattern.IsMatch(strNumber); } // Function to Test for Integers both Positive & Negative(整数) publicbool IsInteger(String strNumber) { Regex objNotIntPattern=new Regex("[^0-9-]"); Regex objIntPattern=new Regex("^-[0-9]+$|^[0-9]+$"); return!objNotIntPattern.IsMatch(strNumber) && objIntPattern.IsMatch(strNumber); } // Function to Test for Positive Number both Integer & Real publicbool IsPositiveNumber(String strNumber) { Regex objNotPositivePattern=new Regex("[^0-9.]"); Regex objPositivePattern=new Regex("^[.][0-9]+$|[0-9]*[.]*[0-9]+$"); Regex objTwoDotPattern=new Regex("[0-9]*[.][0-9]*[.][0-9]*"); return!objNotPositivePattern.IsMatch(strNumber) && objPositivePattern.IsMatch(strNumber) && !objTwoDotPattern.IsMatch(strNumber); } // Function to test whether the string is valid number or not(数字) publicbool 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 +")"); return!objNotNumberPattern.IsMatch(strNumber) && !objTwoDotPattern.IsMatch(strNumber) && !objTwoMinusPattern.IsMatch(strNumber) && objNumberPattern.IsMatch(strNumber); } // Function To test for Alphabets(字母). publicbool IsAlpha(String strToCheck) { Regex objAlphaPattern=new Regex("[^a-zA-Z]"); return!objAlphaPattern.IsMatch(strToCheck); } // Function to Check for AlphaNumeric(包括字母与数字的). publicbool IsAlphaNumeric(String strToCheck) { Regex objAlphaNumericPattern=new Regex("[^a-zA-Z0-9]"); return!objAlphaNumericPattern.IsMatch(strToCheck); } }