using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
// your code goes here
string resultString = null;
try {
string subjectString = "alabala-1000 Intern";
resultString = Regex.Replace(subjectString, @"(.+)-(\d+)\s+(.+)", @"$1/$1-$2/$3");
Console.WriteLine(resultString);
} catch (ArgumentException ex) {
// Syntax error in the regular expression
}
}
}
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