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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		var text = "Text  4000751111115425";
  9.     	var result = Regex.Match(text, @"(?<!\d)\d{6}(\d+)(?=\d{4}(?!\d))")?.Groups[1].Value;
  10.         Console.WriteLine($"Result: '{result}'");
  11. 	}
  12. }
Success #stdin #stdout 0.07s 27616KB
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stdin
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Standard input is empty
stdout
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Result: '111111'
https://ideone.com/WEKIS0
language:
C# (gmcs 5.20.1)
created:
2 years ago
visibility:
secret

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