Using LINQ to parse the numbers from a string

Question

Is it possible to write a query where we get all those characters that could be parsed into int from any given string?

For example we have a string like: "$%^DDFG 6 7 23 1"

Result must be "67231"

And even slight harder: Can we get only first three numbers?

Answer 1

public static string DigitsOnly(string strRawData)
  {
     return Regex.Replace(strRawData, "[^0-9]", "");
  }