C#正则表达式应用范例

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