我有一个大字符串，我想在字符串中找到4个序列号。我如何得到它？
例如：
string a=@"I(1946) am a string and I have some character and number and some sign like 4412 but I must find 4 sequence numbers in this."
预期结果：“ 1946”和“ 4412”
string a=@"2015/10/13 is my birthday.I love this date1234!"
预期结果：“ 2015”和“ 1234”
string a=@"xx888xx88x9xx99x9999xx"
预期结果：“ 9999”
您可以使用正则表达式执行此操作，例如：
var regex = new Regex(@"\d{4}");
string a=@"I(1946) am a string and I have some character and number and some sign like 4412 but I must find 4 sequence numbers in this.";
foreach(Match match in regex.Matches(a))
Console.WriteLine(match.Value);
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