Regex gets NUMBER from String only

Question

I get "7+" or "5+" or "+5" from XML and want to extract only a number from a string using Regex. for example, the function Regex.Match ()

stringThatHaveCharacters = stringThatHaveCharacters.Trim(); Match m = Regex.Match(stringThatHaveCharacters, "WHAT I USE HERE"); int number = Convert.ToInt32(m.Value); return number; 

Answer 1

\d+

\d represents any digit, + for one or more. If you want to dial negative numbers as well, you can use -?\d+ .

Please note that as a string it should be represented in C # as "\\d+" or @"\d+"

Answer 2

The answers above are wonderful. If you need to parse all numbers from a string carrying a sequence, then some help may be provided:

 string input = "1-205-330-2342"; string result = Regex.Replace(input, @"[^\d]", ""); Console.WriteLine(result); // >> 12053302342 

Answer 3

Either [0-9] or \d ¹ should be enough if you need only one digit. Add + if you need more.

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1 The semantics are slightly different since \d potentially matches any decimal digit in any script that uses a decimal digit.