正则表达式的一个简单例子

古城微笑少年丶 2022-08-25 12:47 207阅读 0赞

![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] /\*\*/ /\*  
![InBlock.gif][]  
![InBlock.gif][]csc /r:System.Text.RegularExpressions.dll,System.dll Validation.cs   
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\*/   
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![None.gif][] using  System.Text.RegularExpressions;  
![None.gif][] using  System;  
![None.gif][]  
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![None.gif][] class  Validation  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ... \{  
![InBlock.gif][]public static void Main()  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]String strToTest;  
![InBlock.gif][]Validation objValidate=new Validation();  
![InBlock.gif][]  
![InBlock.gif][]Console.Write("Enter a String to Test for Alphabets:");  
![InBlock.gif][]strToTest=Console.ReadLine();  
![InBlock.gif][]if(objValidate.IsAlpha(strToTest))  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Console.WriteLine("\{0\} is Valid Alpha String",strToTest);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]else  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Console.WriteLine("\{0\} is not a Valid Alpha String",strToTest);  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to test for Positive Integers.  
![InBlock.gif][]  
![InBlock.gif][]public bool IsNaturalNumber(String strNumber)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objNotNaturalPattern=new Regex("\[^0-9\]");  
![InBlock.gif][]Regex objNaturalPattern=new Regex("0\*\[1-9\]\[0-9\]\*");  
![InBlock.gif][]  
![InBlock.gif][]return !objNotNaturalPattern.IsMatch(strNumber) &&  
![InBlock.gif][]objNaturalPattern.IsMatch(strNumber);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to test for Positive Integers with zero inclusive  
![InBlock.gif][]  
![InBlock.gif][]public bool IsWholeNumber(String strNumber)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objNotWholePattern=new Regex("\[^0-9\]");  
![InBlock.gif][]  
![InBlock.gif][]return !objNotWholePattern.IsMatch(strNumber);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to Test for Integers both Positive & Negative  
![InBlock.gif][]  
![InBlock.gif][]public bool IsInteger(String strNumber)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objNotIntPattern=new Regex("\[^0-9-\]");  
![InBlock.gif][]Regex objIntPattern=new Regex("^-\[0-9\]+$|^\[0-9\]+$");  
![InBlock.gif][]  
![InBlock.gif][]return !objNotIntPattern.IsMatch(strNumber) &&  
![InBlock.gif][]objIntPattern.IsMatch(strNumber);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to Test for Positive Number both Integer & Real  
![InBlock.gif][]  
![InBlock.gif][]public bool IsPositiveNumber(String strNumber)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objNotPositivePattern=new Regex("\[^0-9.\]");  
![InBlock.gif][]Regex objPositivePattern=new Regex("^\[.\]\[0-9\]+$|\[0-9\]\*\[.\]\*\[0-9\]+$");  
![InBlock.gif][]Regex objTwoDotPattern=new Regex("\[0-9\]\*\[.\]\[0-9\]\*\[.\]\[0-9\]\*");  
![InBlock.gif][]  
![InBlock.gif][]return !objNotPositivePattern.IsMatch(strNumber) &&  
![InBlock.gif][]objPositivePattern.IsMatch(strNumber) &&  
![InBlock.gif][]!objTwoDotPattern.IsMatch(strNumber);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to test whether the string is valid number or not  
![InBlock.gif][]public bool IsNumber(String strNumber)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objNotNumberPattern=new Regex("\[^0-9.-\]");  
![InBlock.gif][]Regex objTwoDotPattern=new Regex("\[0-9\]\*\[.\]\[0-9\]\*\[.\]\[0-9\]\*");  
![InBlock.gif][]Regex objTwoMinusPattern=new Regex("\[0-9\]\*\[-\]\[0-9\]\*\[-\]\[0-9\]\*");  
![InBlock.gif][]String strValidRealPattern="^(\[-\]|\[.\]|\[-.\]|\[0-9\])\[0-9\]\*\[.\]\*\[0-9\]+$";  
![InBlock.gif][]String strValidIntegerPattern="^(\[-\]|\[0-9\])\[0-9\]\*$";  
![InBlock.gif][]Regex objNumberPattern =new Regex("(" \+ strValidRealPattern \+")|(" \+ strValidIntegerPattern \+ ")");  
![InBlock.gif][]  
![InBlock.gif][]return !objNotNumberPattern.IsMatch(strNumber) &&  
![InBlock.gif][]!objTwoDotPattern.IsMatch(strNumber) &&  
![InBlock.gif][]!objTwoMinusPattern.IsMatch(strNumber) &&  
![InBlock.gif][]objNumberPattern.IsMatch(strNumber);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function To test for Alphabets.  
![InBlock.gif][]  
![InBlock.gif][]public bool IsAlpha(String strToCheck)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objAlphaPattern=new Regex("\[^a-zA-Z\]");  
![InBlock.gif][]  
![InBlock.gif][]return !objAlphaPattern.IsMatch(strToCheck);  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]// Function to Check for AlphaNumeric.  
![InBlock.gif][]  
![InBlock.gif][]public bool IsAlphaNumeric(String strToCheck)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]...\{  
![InBlock.gif][]Regex objAlphaNumericPattern=new Regex("\[^a-zA-Z0-9\]");  
![InBlock.gif][]  
![InBlock.gif][]return !objAlphaNumericPattern.IsMatch(strToCheck);   
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\}   
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