Hello Everyone.

I am working on a .NET 3.5 project that needs a regex for date range.  I have tried using Expresso and have searched http://regexlib.com/ but have come up empty handed.

the regex needs to be able to accept the following input (yyyy - yyyy) AND (yyyy) can can not accept years earlier than 1900 or later than 3000 (needs to cap somewhere)

here are some examples of some valid entries
1999 - 2000
1980 - 1981
2008

here are some examples of invalid entries
1800 - 1801
asdf
12345

Thank you so much for the help.

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Chase

Visual Studio 2008
ASP.NET 3.5 (Visual Basic)

You do understand that a regex is not going be able to tell you if your values are ascending, right? http://regexadvice.com/blogs/mash/archive/2007/06/01/Are-you-ready-for-regex_3F00_.aspx

You can check that both values are within a range but not that the first is less than the second.  You'd have to do that in your code. Also regexes to match ranges aren't always easy to adjust.

\b(((19|2\d)\d\d)|3000)\b

would find 4 digit values within range you asked for.

\b(((19|2\d)\d\d)|3000)\b(\x20*-\x20*\b(((19|2\d)\d\d)|3000)\b)?

matches your samples but also would match 1999-1990

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Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein