0953名無しさん@お腹いっぱい。
2018/10/12(金) 12:53:00.30ID:7mFWe/JT0var s = "<th class=\"a-taC\">10/11(木)</th>";
var valid = new Regex(@"<th class=""a-taC"">(?<month>\d?\d)/(?<day>\d?\d)((月|火|水|木|金))</th>");
var matches = valid.Matches(s);
Console.WriteLine(matches.Count);