Use Regex source generator

[martincostello]

For net7.0 and later we can look to leverage the Regex source generator to improve performance.

For example:

Swashbuckle.AspNetCore/src/Swashbuckle.AspNetCore.SwaggerGen/XmlComments/XmlCommentsTextHelper.cs

Lines 10 to 13 in 830c5a6

	private static Regex RefTagPattern = new Regex(@"<(see|paramref) (name|cref|langword)=""([TPF]{1}:)?(?<display>.+?)"" ?/>");
	private static Regex CodeTagPattern = new Regex(@"<c>(?<display>.+?)</c>");
	private static Regex MultilineCodeTagPattern = new Regex(@"<code>(?<display>.+?)</code>", RegexOptions.Singleline);
	private static Regex ParaTagPattern = new Regex(@"<para>(?<display>.+?)</para>", RegexOptions.Singleline);

[martincostello]

Turns out those are the only static occurences in the whole code base. All the others are based on dynamic inputs.

[Saibamen]

How much perf boost after your changes?

[martincostello]

I didn't measure.