.NET Regular Expression Help

Question

I'm trying to validate an input field value that has the following validatino rules:

Either a number, OR
A number with a trailing 'A', 'K', or 'W'

some valid values : '1', '12', '1A', '12W' some invalid values : 'A', 'abc', '11A1', '1 A'

Any pointer appreciated. Thx

Please post the code you have written so far. People generally do not like to just write your code for you. — Mitch Wheat
– Mitch Wheat, Commented Jun 19, 2011 at 9:48
The problem would appear easier if the description said "a number with an optional trailing letter". Also, what sort of a text box? Webforms? MVC? WPF? Windows Forms? Other? And what is a number? How about negative numbers, or decimals? — Kobi
– Kobi, Commented Jun 19, 2011 at 9:54

Mat · Accepted Answer · 2011-06-19 09:56:33Z

/^\d+[AKW]?$/

\d+ means one or more digits. [AKW]? matches one A or K or W, or nothing (? could be interpreted as meaning "optional"). The ^ and $ are anchors that match the start and end of the string respectively.

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