Why is this an issue?

Shared naming conventions allow teams to collaborate efficiently. This rule checks that all enum names match a provided regular expression.

The default configuration is the one recommended by Microsoft:

• Pascal casing, starting with an upper case character, e.g. BackColor
• Short abbreviations of 2 letters can be capitalized, e.g. GetID
• Longer abbreviations need to be lower case, e.g. GetHtml
• If the enum is marked as [Flags] then its name should be plural (e.g. MyOptions), otherwise, names should be singular (e.g. MyOption)

Noncompliant code example

With the default regular expression for non-flags enums: ^([A-Z]{1,3}[a-z0-9]+)*([A-Z]{2})?$

Public Enum foo ' Noncompliant
    FooValue = 0
End Enum

With the default regular expression for flags enums: ^([A-Z]{1,3}[a-z0-9]+)*([A-Z]{2})?s$

<Flags()>
Public Enum Option ' Noncompliant
    None = 0,
    Option1 = 1,
    Option2 = 2
End Enum

Compliant solution

Public Enum Foo
    FooValue = 0
End Enum

<Flags()>
Public Enum Options
    None = 0,
    Option1 = 1,
    Option2 = 2
End Enum