Regex TagValidation — [GeneratedRegex] Source Generator

[leecampbell-codeagent]

File: HistogramBase.cs

private static readonly Regex TagValidation = new Regex("[, \\r\\n]", RegexOptions.Compiled);

On .NET 8 this should use the [GeneratedRegex] source generator, which produces fully AOT-safe, allocation-free regex matching with no startup compilation cost:

[GeneratedRegex("[, \\r\\n]")]
private static partial Regex TagValidation();

Minor on its own, but it's the right modern pattern and eliminates the compiled-regex warm-up allocation.