Regular expressions in ASP.NET

I need a regex pattern to match this format ABC12345678:

it should start with ABC an开发者_开发技巧d should have preceding 8 numbers.

The pattern you're looking for is

ABC\d{8}

Whenever I have to write a regex (which I try to avoid as much as possible), I refer to this .NET regex cheat sheet.

txt2re is a great online resource for creating regex from a string. It also generates code samples in many languages including c#.