Extract a string using regular expressions [closed]

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I'm probably not using the right search term, because I keep finding

'matching\validating' string with regex (returns boolean) while I want is to extract a string from an other string.

How can I extract some part开发者_运维百科s of a string using a regex pattern?

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It's matching that you are looking for. The Regex.Match and Regex.Matches methods use a regular expression to find one or several parts of a string, and returns a Match or MatchCollection with the result.

Example:

string input = "Some string with 123 numbers in it. Yeah 456!";

MatchCollection result = Regex.Matches(input, @"\d+");
foreach (Match m in result) {
  Console.WriteLine(m.Value);
}

Output:

123
456