regex matches with intersection in C#

问题:

I wonder if it is possible to get MatchCollection with all matches even if there's intersection among them.

string input = "a a a"; Regex regex = new Regex("a a"); MatchCollection matches = regex.Matches(input); Console.WriteLine(matches.Count); 

This code returns 1, but I want it to return 2. How to achive it?
Thank you for your help.

回答1:

string input = "a a a"; Regex regexObj = new Regex("a a"); Match matchObj = regexObj.Match(input); while (matchObj.Success) {     matchObj = regexObj.Match(input, matchObj.Index + 1);  } 

will iterate over the string starting the next iteration one character after the position of the previous match, therefore finding all matches.

回答2:

You can do it in a while loop by replacing "a a" by "a" and match it another time against the regex until there is no match.

文章来源: regex matches with intersection in C#