记录自己写的：string d = @"(?is)<d\s.*?>(.*?)</d>";

string image = @"(?is)<image.*?/>";

string imageid = "<d[^>]*?name=(['\"\"]?)(?<name>[^'\"\"\\s>]+)\\1[^>]*>";

string tdpatterns = @"(?is)<td[^>]*>(?<pvalue>(?><td[^>]*>(?<o>)|</td>(?<-o>)|(?:(?!</?td\b).)*)*(?(o)(?!)))</td>";