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SYSLIB0052 warning - APIs that support obsolete mechanisms for Regex extensibility are obsolete
Learn about the obsoletion of APIs that support obsolete mechanisms for Regex extensibility that generates compile-time warning SYSLIB0052.
09/08/2023
syslib0052

SYSLIB0052: APIs that support obsolete mechanisms for Regex extensibility are obsolete

The following xref:System.Text.RegularExpressions.Regex and xref:System.Text.RegularExpressions.RegexRunner APIs are obsolete, starting in .NET 8. Calling them in code generates warning SYSLIB0052 at compile time. These APIs supported the now obsolete xref:System.Text.RegularExpressions.Regex.CompileToAssembly%2A.

  • xref:System.Text.RegularExpressions.Regex.InitializeReferences?displayProperty=nameWithType
  • xref:System.Text.RegularExpressions.Regex.UseOptionC?displayProperty=nameWithType
  • xref:System.Text.RegularExpressions.Regex.UseOptionR?displayProperty=nameWithType
  • xref:System.Text.RegularExpressions.RegexRunner.CharInSet(System.Char,System.String,System.String)?displayProperty=nameWithType
  • xref:System.Text.RegularExpressions.RegexRunner.Scan(System.Text.RegularExpressions.Regex,System.String,System.Int32,System.Int32,System.Int32,System.Int32,System.Boolean)?displayProperty=nameWithType
  • xref:System.Text.RegularExpressions.RegexRunner.Scan(System.Text.RegularExpressions.Regex,System.String,System.Int32,System.Int32,System.Int32,System.Int32,System.Boolean,System.TimeSpan)?displayProperty=nameWithType

Workaround

N/A

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0052

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0052

To suppress all the SYSLIB0052 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0052</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.