c# regex matches example to extract result-CodePudding

I am trying to extract a character/digit from a string that is between single quotes and seems like i am failing to write the correct pattern.

Test string - only value that changes is the single character/digit in single quotes

[ ] Random session part: 'm'

I am using the following pattern but it returns empty

        var line = "[ ] Random session part: 'm'";
        Regex pattern = new Regex(@"(?<=\')(.*?)(?=\')");
        Match match = pattern.Match(line);
        Debug.Log($"{match.Groups["postfix"].Value}");
        int postFix = int.Parse(match.Groups["postfix"].Value);

what am i missing?

CodePudding user response：

You have an overly complicated regex, and looking for a group named 'postfix' in you match, while your regex does not have such a named group.

A simpler regex would be:

'(.)'

This looks for a single character between two single quotes, and has that character wrapped in a capture group. Put a breakpoint after your match row, and you can explore the matched object.

You can explore the regex above with your match here: https://regexr.com/77b0m

BTW: Your code tries to parse the string "m" into an int, this will throw and error, your should probably handle that case with int.TryParse

CodePudding user response：

you can use this regX :

(?<=\')(.*?)(?=\')

show result