Regular expression where part of string must be number between 0-100

Question

I need to validate serial numbers. For this we use regular expressions in C#, and a certain product, part of the serial number is the \"seconds since midnight\". There are

Answer 1

I would use regex combined with some .NET code to accomplish this. A pure regex solution isn't going to be easy or efficient to handle large number ranges.

But this will:

Regex myRegex = new Regex(@"\d{9}-(\d{5})-\d{6}");
String value = myRegex.Replace(@"654984051-86400-231324", "$1");

This will grab the value 86400 in this case. And then you'd just check if the captured number is between 0 and 86400 as per Jason's answer.