Initial commit

vs4win/Chapter07/SharedLibrary/SharedLibrary.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+		<PackageId>Packt.CSdotnet.SharedLibrary</PackageId>
+		<PackageVersion>7.0.0.0</PackageVersion>
+		<Title>C# 11 and .NET 7 Shared Library</Title>
+		<Authors>Mark J Price</Authors>
+		<PackageLicenseExpression>
+			MS-PL
+		</PackageLicenseExpression>
+		<PackageProjectUrl>
+			https://github.com/markjprice/cs11dotnet7
+		</PackageProjectUrl>
+		<PackageIcon>packt-csdotnet-sharedlibrary.png</PackageIcon>
+		<PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+		<PackageReleaseNotes>
+			Example shared library packaged for NuGet.
+		</PackageReleaseNotes>
+		<Description>
+			Three extension methods to validate a string value.
+		</Description>
+		<Copyright>
+			Copyright © 2016-2022 Packt Publishing Limited
+		</Copyright>
+		<PackageTags>string extensions packt csharp dotnet</PackageTags>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<None Include="packt-csdotnet-sharedlibrary.png">
+			<Pack>True</Pack>
+			<PackagePath></PackagePath>
+		</None>
+	</ItemGroup>
+
+</Project>

vs4win/Chapter07/SharedLibrary/StringExtensions.cs

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+using System.Text.RegularExpressions;
+
+namespace Packt.Shared
+{
+  public static class StringExtensions
+  {
+    public static bool IsValidXmlTag(this string input)
+    {
+      return Regex.IsMatch(input,
+        @"^<([a-z]+)([^<]+)*(?:>(.*)<\/\1>|\s+\/>)$");
+    }
+
+    public static bool IsValidPassword(this string input)
+    {
+      // minimum of eight valid characters
+      return Regex.IsMatch(input, "^[a-zA-Z0-9_-]{8,}$");
+    }
+
+    public static bool IsValidHex(this string input)
+    {
+      // three or six valid hex number characters
+      return Regex.IsMatch(input,
+        "^#?([a-fA-F0-9]{3}|[a-fA-F0-9]{6})$");
+    }
+  }
+}