C#正则表达式应用范例
2006-07-02 21:27
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C#正则表达式应用范例 | 作者: 来源: 阅读 1226 人次 , 2006-2-16 14:45:00 |
/* <HowToCompile> csc /r:System.Text.RegularExpressions.dll,System.dll Validation.cs </HowToComplie> */ 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 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); } } There is another simple way to perform these validation think of it while the next article comes. |
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