How to understand the greed and non-greed of C #

This article mainly introduces "how to understand the greed and non-greed of C#". In the daily operation, I believe that many people have doubts about how to understand the greed and non-greed of C#. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubt of "how to understand the greed and non-greed of C#"! Next, please follow the editor to study!

The regular expression engine is greedy, and as long as the pattern allows, it will match as many characters as possible. You can change the matching pattern to non-greedy by adding "?" after the "repeat description character" (*, +).

Take a look at the following examples of greed and non-greed of C# regular expressions:

String x = "Live for nothing,die for something"; Regex R1 = new Regex (@ ". * thing"); if (r1.IsMatch (x)) {Console.WriteLine ("match:" + r1.Match (x) .value); / / output: Live for nothing,die for something} Regex R2 = new Regex (@ ". *? thing") If (r2.IsMatch (x)) {Console.WriteLine ("match:" + r2.Match (x) .value); / / output: Live for nothing} at this point, the study on "how to understand greed and non-greed of C#" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!