need help with a couple of RegEx

I'm creating a site usi开发者_如何学JAVAng asp.net and C# and i just need to know some regex to validate/highlight my gridview.

I need to highlight these cells in their own columns:

1- APR, MAR, etc. (three letters exactly)
2- 2011, 2012, etc.  (year)
3- blank cell in gridview

Some links/tutorials on basic regex would also help me.

1. [A-Z]{3}
2. \d{4}

For 1, you could also use (JAN|FEB|MAR|APR|...) (you get the idea). Also, if you wanted to match all Unicode letters, you could swap [A-Z] with \pL.

If you didn't want these matched midstring, add a word boundary (\b) on each side.

The regex part is already answered by @alex (+1), here is the information about regexes.

Sites where you can test your regexes online (very helpful!)

• regexstorm.net/tester
• refiddle.com/
• gskinner.com/RegExr/

Online resources on regex.

• .NET Framework Regular Expressions
• www.regular-expressions.info/ (Very helpful site about all regex flavors)
• Perlretut (About Perl regex, but anyway helpful)