c#提取字符串中，所有指定字符后面的学号

Question

比如一个字符串"学号20201234学号20201235学号20201236学号20201237学号20201238学号20201239"

我想提取所有"学号"后面的数字

Answer 1

可以用正则表达式

using System;
using System.Text.RegularExpressions;

public class Example
{
   public static void Main()
   {
      string input = "学号20201234学号20201235学号20201236学号20201237学号20201238学号20201239";
      string pattern = @"(?<=学号)\d+";

      foreach (Match match in Regex.Matches(input, pattern))
         Console.WriteLine(match.Value);
   }
}