How to convert regex match.Value to integer?
c#, regex
Solution
Use `match.Groups[1].Value` instead of `match.Value` to just get the string found inside the brackets - i.e. not including the brackets themselves.
Use `\d*?` instead of `.?*` to ensure you're only matching digits, not anything in brackets!
Then you don't even need the `?` any more because `\d` doesn't match a closing bracket.
Instead of switching to look in `Groups[1]`, you can use lookarounds in a regular expression such as
(?<=\()\d(?=\))
to make sure `Match` only contains the digits themselves.
Problem
``` List<int> ids = ExtractIds("United Kingdom (656) - Aberdeen (7707)"); ``` The above list should be populated by the method below, which strips the values from within parenthesis. If I use match.Value as a string and assign it to List< string > it seems to work ok. But when I try to convert it to an integer I get the error: "Input string was not in a correct format." What am I doing wrong? ``` public List<int> ExtractIds(string str) { MatchCollection matchCollection = Regex.Matches(str, @"\((.*?)\)"); List<int> ExtractedIds = new List<int>(); foreach (Match match in matchCollection) { int theid = int.Parse(match.Value); ExtractedIds.Add(theid); } return ExtractedIds; } ```