Mega Code Archive

 

Categories / C# / Data Types

 

Use regular expression to get number from string

using System; using System.Data; using System.Text.RegularExpressions; class Class1{         static void Main(string[] args){       string IsNotNum = "111west";       string IsNum = "  +111  ";       string IsFloat = "  23.11  ";       string IsExp = "  +23 e+11  ";              Console.WriteLine(GetNumberFromStr(IsNum));    // +111       Console.WriteLine(GetNumberFromStr(IsNotNum));  //        Console.WriteLine(GetNumberFromStr(IsFloat));  // 23.11       Console.WriteLine(GetNumberFromStr(IsExp));    //          }     public static string GetNumberFromStr(string str)     {       str = str.Trim();       Match m = Regex.Match(str, @"^[\+\-]?\d*\.?[Ee]?[\+\-]?\d*$");       return (m.Value);     }      }