.NET正则表达式帮助

Question

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

1. Either a number, OR
2. 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

Answer 1

/^\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.