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I am new to asp.net can you help me to find out how to find and extract the numbers from string in Asp.net.

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  • can you please explain more with some example ? Commented Dec 9, 2013 at 4:47

2 Answers 2

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Method 1:

       String str = "udsdf34dfd78"; /*any string*/
       String strNumber = "";
       Regex regex=new Regex(@"\d");

       foreach (Match m in regex.Matches(str))
           strNumber += m.Value;

Method 2: 

              String str = "udsdf34dfd78"; /*any string*/
              String strNumber = ""; 
              foreach (Char c in str)
               if (Char.IsDigit(c))
                   strNumber += c.ToString();
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string output = new string(input.Where(char.IsDigit).ToArray());
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4 Comments

This way is very slow
@ShahroozJefriㇱ depends on length of the string
Yes but regix is better
A regex isn't free either. You won't notice a thing for both methods, you're too focused on premature optimization.