C#正则表达式应用范例

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]*$";