Added StringSyntaxAttribute example

Author: linkdotnet

StringHighlighting/Program.cs

@@ -0,0 +1,13 @@
+using System.Diagnostics.CodeAnalysis;
+
+void SomeRegex([StringSyntax(StringSyntaxAttribute.Regex)] string regex) { }
+
+void SomeDate([StringSyntax(StringSyntaxAttribute.DateTimeFormat)] string dateTime) { }
+
+void SomeFormat(
+    [StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format,
+    params object[] args) { }
+
+SomeFormat("Hello {0} {1}", "World", "Test");
+SomeDate("h:mm:ss tt zz");
+SomeRegex("");

StringHighlighting/README.md

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+# Give your strings context with StringSyntaxAttribute
+
+Strings are one of the most universal data types. We use them for URLs or regular expressions or even to define some date. With .NET 7 we have a new way of giving those strings a bit of meaning. Meet `StringSyntaxAttribute`.
+
+I also show you a way how to use them in .NET 6 and earlier.
+
+Found [here](https://steven-giesel.com/blogPost/d2b2fc18-ca4c-4879-b87f-a1d36f435805)

StringHighlighting/StringHighlighting.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    </PropertyGroup>
+
+</Project>

StringHighlighting/StringHighlighting.sln

@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StringHighlighting", "StringHighlighting.csproj", "{DD0FC98A-EE3F-478B-AD28-75F5000F56EB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DD0FC98A-EE3F-478B-AD28-75F5000F56EB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DD0FC98A-EE3F-478B-AD28-75F5000F56EB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DD0FC98A-EE3F-478B-AD28-75F5000F56EB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DD0FC98A-EE3F-478B-AD28-75F5000F56EB}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

StringHighlighting/StringSyntaxAttribute.cs

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+#if !NET7_0_OR_GREATER
+
+// The namespace is important
+namespace System.Diagnostics.CodeAnalysis;
+
+/// <summary>Fake version of the StringSyntaxAttribute, which was introduced in .NET 7</summary>
+public sealed class StringSyntaxAttribute : Attribute
+{
+    /// <summary>The syntax identifier for strings containing composite formats.</summary>
+    public const string CompositeFormat = nameof(CompositeFormat);
+
+    /// <summary>The syntax identifier for strings containing regular expressions.</summary>
+    public const string Regex = nameof(Regex);
+
+    /// <summary>The syntax identifier for strings containing date information.</summary>
+    public const string DateTimeFormat = nameof(DateTimeFormat);
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="StringSyntaxAttribute"/> class.
+    /// </summary>
+    public StringSyntaxAttribute(string syntax)
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="StringSyntaxAttribute"/> class.
+    /// </summary>
+    public StringSyntaxAttribute(string syntax, params object?[] arguments)
+    {
+    }
+}
+#endif