使用证则表达式验证数字: 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(); //Change here to whatever validation you want to perform 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. public bool 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 public bool IsWholeNumber(string strNumber) { Regex objNotWholePattern=new Regex("[^0-9]"); return !objNotWholePattern.IsMatch(strNumber); } // Function to Test for Integers both Positive & Negative public bool 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 public bool 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 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 + ")"); return !objNotNumberPattern.IsMatch(strNumber) && !objTwoDotPattern.IsMatch(strNumber) && !objTwoMinusPattern.IsMatch(strNumber) && objNumberPattern.IsMatch(strNumber); } // Function To test for Alphabets. public bool IsAlpha(string strToCheck) { Regex objAlphaPattern=new Regex("[^a-zA-Z]"); return !objAlphaPattern.IsMatch(strToCheck); } // Function to Check for AlphaNumeric. public bool IsAlphaNumeric(string strToCheck) { Regex objAlphaNumericPattern=new Regex("[^a-zA-Z0-9]"); return !objAlphaNumericPattern.IsMatch(strToCheck); }}
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();
//Change here to whatever validation you want to perform
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. public bool 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 public bool IsWholeNumber(string strNumber)
{
Regex objNotWholePattern=new Regex("[^0-9]"); return !objNotWholePattern.IsMatch(strNumber);
} // Function to Test for Integers both Positive & Negative public bool 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 public bool 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
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 + ")"); return !objNotNumberPattern.IsMatch(strNumber) &&
!objTwoDotPattern.IsMatch(strNumber) &&
!objTwoMinusPattern.IsMatch(strNumber) &&
objNumberPattern.IsMatch(strNumber);
} // Function To test for Alphabets. public bool IsAlpha(string strToCheck)
{
Regex objAlphaPattern=new Regex("[^a-zA-Z]"); return !objAlphaPattern.IsMatch(strToCheck);
} // Function to Check for AlphaNumeric. public bool IsAlphaNumeric(string strToCheck)
{
Regex objAlphaNumericPattern=new Regex("[^a-zA-Z0-9]"); return !objAlphaNumericPattern.IsMatch(strToCheck);
}}
public bool checkNum(string sNum)
{
int isDec = 0;
for(int i=0;i<sNum.Length;i++)
{
if(sNum[i]=='.') isDec++;
if((!char.IsNumber(sNum,i) && sNum[i]!='.')|| isDec>1) return false;
}
return true;
}