正則表達式問題解析季節/情節模式

Question

為什么此正則表達式模式無法正確解析字符串“ Season 02 Episode 01”？

例如，這不是匹配項：

var fileName = "Its Always Sunny in Philadelphia Season 02 Episode 01 - Charlie Gets Crippled.avi"

// Regex explanation:
// Starts with "S" and can contain more letters, can continue with space, then contains two numbers.
// Then starts with "E" again and can contain more letters, can continue with space, then contains two numbers. 
var pattern = @"S\w?\s?(\d\d)\s?E\w?\s?(\d\d)";
var regex = new Regex(pattern, RegexOptions.IgnoreCase);
var match = regex.Match(fileName);  

Answer 1

使用*代替?

? 是0或1次。 *表示0次或多次。

Answer 2

以“ S”開頭，可以包含更多字母[...]

你的意思是+ ，不是? 。

var pattern = @"S\w+\s+(\d+)\s+E\w+\s+(\d+)";

請注意，此正則表達式非常明確。 當心誤報。 我建議使表達式更具體。