Remove obsolete properties and update project files

Removed obsolete properties from TextExtensions and updated SplitTests to use RegexPatterns. Incremented version to 8.2.1 in Open.Text.csproj. Added .NET 9.0 support in Open.Text.Tests.csproj.

Author: electricessence

Source/Extensions._.cs

@@ -30,21 +30,6 @@ private static IEnumerable<string> NumberLabels
 		}
 	}
 
-	/// <inheritdoc cref="RegexPatterns.ValidAlphaNumericOnlyPattern"/>
-	[Obsolete("Use RegexPatterns.ValidAlphaNumericOnlyPattern.")]
-	public static Regex ValidAlphaNumericOnlyPattern
-		=> RegexPatterns.ValidAlphaNumericOnlyPattern;
-
-	/// <inheritdoc cref="RegexPatterns.ValidAlphaNumericOnlyUntrimmedPattern"/>
-	[Obsolete("Use RegexPatterns.ValidAlphaNumericOnlyUntrimmedPattern.")]
-	public static Regex ValidAlphaNumericOnlyUntrimmedPattern
-		=> RegexPatterns.ValidAlphaNumericOnlyUntrimmedPattern;
-
-	/// <inheritdoc cref="RegexPatterns.WhiteSpacePattern"/>
-	[Obsolete("Use RegexPatterns.WhiteSpacePattern.")]
-	public static Regex WhiteSpacePattern
-		=> RegexPatterns.WhiteSpacePattern;
-
 	/// <summary>
 	/// Converts a string to title-case.
 	/// </summary>

Source/Open.Text.csproj

@@ -20,7 +20,7 @@
 		<RepositoryUrl>https://github.com/Open-NET-Libraries/Open.Text</RepositoryUrl>
 		<RepositoryType>git</RepositoryType>
 		<PackageTags>string, span, enum, readonlyspan, text, format, split, trim, equals, trimmed equals, first, last, preceding, following, stringbuilder, extensions, stringcomparable, spancomparable, stringsegment, splitassegment</PackageTags>
-		<Version>8.2.0</Version>
+		<Version>8.2.1</Version>
 		<PackageReleaseNotes></PackageReleaseNotes>
 		<PackageLicenseExpression>MIT</PackageLicenseExpression>
 		<PublishRepositoryUrl>true</PublishRepositoryUrl>

Tests/Open.Text.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net472;net6.0;net8.0;net9.0;</TargetFrameworks>
 		<Nullable>enable</Nullable>
 		<IsPackable>false</IsPackable>
 		<LangVersion>latest</LangVersion>

Tests/SplitTests.cs

@@ -103,19 +103,16 @@ public static void Split(string sequence, StringSplitOptions options = StringSpl
 		Assert.Equal(sequence.Split("I,", options), span.Split("i,", options, StringComparison.OrdinalIgnoreCase));
 #endif
 
-#pragma warning disable CS0618 // Type or member is obsolete
-		// Use obsolete values to ensure they still work.
 		Assert.Equal(
-			TextExtensions
+			RegexPatterns
 			.ValidAlphaNumericOnlyPattern
 			.Matches(sequence)
 			.Cast<Match>()
 			.Select(m => m.Value),
-			TextExtensions
+			RegexPatterns
 			.ValidAlphaNumericOnlyPattern
 			.AsSegments(sequence)
 			.Select(m => m.Value));
-#pragma warning restore CS0618 // Type or member is obsolete
 
 		var stringSegment = sequence.AsSegment();
 		var ss = stringSegment.SplitAsSegments(",", options).Select(s => s.Value).ToArray();