Finding all numbers in a string

Question

Part of my app has an area where users enter text into a textBox control. They will be entering both text AND numbers into the textBox. When the user pushes a button, the te

Answer 1

You can use a regular expression that matches the numbers, and use the Regex.Replace method. I'm not sure what you include in the term "numbers", but this will replace all non-negative integers, like for example 42 and 123456:

str = Regex.Replace(
  str,
  @"\d+",
  m => (Double.Parse(m.Groups[0].Value) * 1.14).ToString()
);

If you need some other definition of "numbers", for example scientific notation, you need a more elaboarete regular expression, but the principle is the same.

Answer 2

Freely adopted from the sample here

Beware of your regional options (since you're parsing and serializing floating point numbers)

using System;
using System.Text.RegularExpressions;

class MyClass
{
   static void Main(string[] args)
   {
      var input = "a 1.4 b 10";

      Regex r = new Regex(@"[+-]?\d[\d\.]*"); // can be improved

      Console.WriteLine(input);
      Console.WriteLine(r.Replace(input, new MatchEvaluator(ReplaceCC)));
   }

   public static string ReplaceCC(Match m)
   {
       return (Double.Parse(m.Value) * 1.14).ToString();
   }
}

[mono] ~ @ mono ./t.exe
a 1.4 b 10
a 1.596 b 11.4