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Faster way 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(GetNumberFromStrFaster(IsNum));    // +111       Console.WriteLine(GetNumberFromStrFaster(IsNotNum));  //        Console.WriteLine(GetNumberFromStrFaster(IsFloat));    // 23.11       Console.WriteLine(GetNumberFromStrFaster(IsExp));    //          }     public static string GetNumberFromStrFaster(string str)     {       str = str.Trim();       Match m = new Regex(@"^[\+\-]?\d*\.?[Ee]?[\+\-]?\d*$", RegexOptions.Compiled).Match(str);       return (m.Value);     } }