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 86400 seconds in a day, but how can I validate it as a 5-digit number in this string?:
654984051-86400-231324
I can't use this concept:
[0-8][0-6][0-4][0-0][0-0]
Because then 86399 wouldn't be valid. How can I overcome this? I want something like:
[00000-86400]
UPDATE
I want to make it clear that I'm aware of - and agree with - the "don't use regular expressions when there's a simpler way" school-of-thought. Jason's answer is exactly how I'd like to do it, however this serial number validation is for all serial numbers that pass through our system - there's currently no custom validation code for these specific ones. In this case I have a good reason for looking for a regex solution.
Of course, if there isn't one, then that makes the case for custom validation for these particular products undeniable, but I wanted to explore this avenue fully before going with a solution that requires code changes.
Don't use regex? If you're struggling to come up with the regex to parse this that says that maybe it's too complex and you should find something simpler. I see absolutely no benefit to using regex here when a simple
int value;
if(!Int32.TryParse(s, out value)) {
throw new ArgumentException();
}
if(value < 0 || value > 86400) {
throw new ArgumentOutOfRangeException();
}
will work just fine. It's just so clear and easily maintainable.
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