Question

I think the title is descriptive

valid: 0.1, 0.15, 0.25, .... and 1

How to include the 1 is the main challenge here. Thanks.

Update

Sorry I can’t write the code. It’s a legacy application that I don’t have access to the source code. The application validation method are already embedded and am using the RegularExpression validator embedded in the app

Answer 1

Regular expressions let you choose between patterns (ie: match pattern A OR pattern B). You do this with the | character (eg: A|B).

Try this:

^(0(\.[0-9]+)?|1(\.0+)?)$