Document GeneratedRegexAttribute property support in .NET 9

[Copilot]

The documentation for GeneratedRegexAttribute only mentioned partial methods, but starting in .NET 9 (preview 6), the attribute can also be applied to partial properties via C# 13's partial property support.

Changes

• Updated introduction to note property support starting in .NET 9
• Added code example demonstrating property syntax:

  [GeneratedRegex("abc|def", RegexOptions.IgnoreCase, "en-US")]
  private static partial Regex AbcOrDefGeneratedRegexProperty { get; }

• Updated Visual Studio navigation tip to reference "method or property declaration"

The property and method approaches are functionally equivalent; properties provide an alternative syntax.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Documenation of GeneratedRegexAttribute does not mention it can be applied to properties as well</issue_title>
<issue_description>### Type of issue

Outdated article

Description

The linked article does never mention that the GeneratedRegexAttribute can also be applied to get-only properties. Originally, it could only be applied to methods, but that was changed in .NET 9-preview 6 link to commit. The online documentation of the attribute itself also does not contain the updated remark, that it can be applied to get-only properties as well. It however shows the correct signature with System.AttributeTargets.Property

Page URL

https://learn.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-source-generators#when-to-use-it

Content source URL

https://github.com/dotnet/docs/blob/main/docs/standard/base-types/regular-expression-source-generators.md

Document Version Independent Id

76b98e7b-6acc-cb43-da8e-475a8b4ed5a1

Platform Id

4db261b2-abb4-466b-330c-7e6791abd68d

Article author

@adegeo

Metadata

• ID: 56298202-fa5d-363d-3c52-adbf5256b184
• PlatformId: 4db261b2-abb4-466b-330c-7e6791abd68d
• Service: dotnet-fundamentals

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Documenation of GeneratedRegexAttribute does not mention it can be applied to properties as well #51558

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docs/standard/base-types/regular-expression-source-generators.md	.NET regular expression source generators

[Copilot]

Pull request overview

This PR updates the regular expression source generators documentation to reflect that GeneratedRegexAttribute can be applied to partial properties (in addition to partial methods) starting in .NET 9. This feature was introduced in .NET 9 preview 6 and leverages C# 13's partial property support.

Changes:

• Updated the introduction to note that the attribute can be applied to partial properties starting in .NET 9
• Added a new code example demonstrating the partial property syntax as an alternative to the partial method approach
• Updated Visual Studio navigation tip to reference both "method or property declaration"