Sample that shows how to create Regex functions using CLR

samples/features/sql-clr/RegEx/.gitignore

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+*.cproj.user
+.vs/*
+.vscode/*
+bin/*
+obj/*
+*.log
+Properties/PublishProfiles/*
+SqlClrRegEx.sql

samples/features/sql-clr/RegEx/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SqlClrRegEx")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SqlClrRegEx")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("265e0bc3-ad5f-44f3-bb17-c61f77b9847f")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

samples/features/sql-clr/RegEx/README.md

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+# Implementing Regular Expressions in SQL Server using CLR UDF 
+SQL Database don't have built-in support for regular expressions, so the only workaround is to use Regular Expressions that exist in .Net framework and expose them as T-SQL functions.
+This code sample demonstrates how to create CLR User-Defined functions that expose regular expression functionalities that exist in .Net framework.
+
+### Contents
+
+[About this sample](#about-this-sample)<br/>
+[Build the CLR/RegEx functions](#build-functions)<br/>
+[Add RegEx functions to your SQL database](#add-functions)<br/>
+[Test the functions](#test)<br/>
+[Disclaimers](#disclaimers)<br/>
+
+<a name=about-this-sample></a>
+
+## About this sample 
+1. **Applies to:** SQL Server 2005+ Enterprise / Developer / Evaluation Edition
+2. **Key features:**
+    - CLR
+3. **Programming Language:** .NET C#
+4. **Author:** Jovan Popovic [jovanpop-msft]
+
+<a name=build-functions></a>
+
+## Build the CLR/RegEx functions
+
+1. Download the source code and open the solution using Visual Studio.
+2. Change the password in .pfk file and rebuild the solution in Retail mode.
+3. Open and save SqlClrRegEx.tt to generate output T-SQL file that will contain script that inserts .dll file with the Regex functions, and exposes them as T-SQL/CLR functions.
+
+<a name=add-functions></a>
+## Add RegEx functions to your SQL database
+
+File SqlClrRegEx.sql contains the code that will import functions into SQL Database.
+
+If you have not added CLR assemblies in your database, you should use the following script to enable CLR:
+```
+sp_configure @configname=clr_enabled, @configvalue=1
+GO
+RECONFIGURE
+GO
+```
+
+Once you enable CLR, you can use the T-SQL script to add the regex functions. The script depends on the location where you have built the project, and might look like:
+```
+--Create the assembly
+CREATE ASSEMBLY SqlClrRegEx FROM 'D:\GitHub\sql-server-samples\samples\features\sql-clr\RegEx\bin\Release\SqlClrRegEx.dll' WITH PERMISSION_SET = SAFE
+GO
+
+CREATE SCHEMA REGEX;
+GO
+
+--Create the functions
+CREATE FUNCTION REGEX.MATCH (@src NVARCHAR(MAX), @regex NVARCHAR(4000))
+RETURNS BIT
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledMatch
+GO
+CREATE FUNCTION REGEX.SUBSTRING (@src NVARCHAR(MAX), @regex NVARCHAR(4000))
+RETURNS NVARCHAR(4000)
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledSubstring
+GO
+CREATE FUNCTION REGEX.REPLACE (@src NVARCHAR(MAX), @regex NVARCHAR(MAX), @value NVARCHAR(4000))
+RETURNS NVARCHAR(MAX)
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledReplace
+GO
+```
+
+This code will import assembly in SQL Database and add three functions that provide RegEx functionalities.
+
+<a name=test></a>
+
+## Test the functions
+
+Once you create the assembly and expose the functions, you can use regular expression functionalities in T-SQL code:
+
+```
+IF( REGEX.MATCH('tst123test', '[0-9]+') = 1 )
+	SELECT REGEX.SUBSTRING('tst123test', '[0-9]+'), REGEX.REPLACE('tst123test', '[0-9]+', 'XXX')
+```
+
+<a name=disclaimers></a>
+
+## Disclaimers
+The code included in this sample is not intended to be a set of best practices on how to build scalable enterprise grade applications. This is beyond the scope of this sample.
+

samples/features/sql-clr/RegEx/RegEx.cs

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+using Microsoft.SqlServer.Server;
+using System.Text.RegularExpressions;
+
+/// <summary>
+/// https://blogs.msdn.microsoft.com/sqlclr/2005/06/29/working-with-regular-expressions/
+/// </summary>
+public partial class RegEx
+{
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static bool Match(string source, string pattern)
+    {
+        Regex r1 = new Regex(pattern);
+        return r1.Match(source).Success;
+    }
+
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static bool CompiledMatch(string source, string pattern)
+    {
+        return Regex.Match(source, pattern, RegexOptions.Compiled).Success;
+    }
+
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static string Substring(string source, string pattern)
+    {
+        Regex r1 = new Regex(pattern);
+        return r1.Match(source).Value;
+    }
+
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static string CompiledSubstring(string source, string pattern)
+    {
+        return Regex.Match(source, pattern, RegexOptions.Compiled).Value;
+    }
+
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static string Replace(string source, string pattern, string value)
+    {
+        return Regex.Replace(source, pattern, value);
+    }
+
+    [SqlFunction(IsDeterministic = true, IsPrecise = true)]
+    public static string CompiledReplace(string source, string pattern, string value)
+    {
+        return Regex.Replace(source, pattern, value, RegexOptions.Compiled);
+    }
+};

samples/features/sql-clr/RegEx/SqlClrRegEx.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>SqlClrRegEx</RootNamespace>
+    <AssemblyName>SqlClrRegEx</AssemblyName>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+  </PropertyGroup>
+  <PropertyGroup>
+    <AssemblyOriginatorKeyFile>SqlClrRegEx.pfx</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Content Include="SqlClrRegEx.sql">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>SqlClrRegEx.tt</DependentUpon>
+    </Content>
+    <Content Include="SqlClrRegEx.tt">
+      <Generator>TextTemplatingFileGenerator</Generator>
+      <LastGenOutput>SqlClrRegEx.sql</LastGenOutput>
+    </Content>
+    <Compile Include="RegEx.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="SqlClrRegEx.pfx" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{508349B6-6B84-4DF5-91F0-309BEEBAD82D}" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

samples/features/sql-clr/RegEx/SqlClrRegEx.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26730.16
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SqlClrRegEx", "SqlClrRegEx.csproj", "{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{265E0BC3-AD5F-44F3-BB17-C61F77B9847F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {54C7E749-77A3-460D-A89A-5AB7943A1F15}
+	EndGlobalSection
+EndGlobal

samples/features/sql-clr/RegEx/SqlClrRegEx.tt

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+<#@output extension=".sql"#>
+<#@ template language="C#" hostspecific="True" #>
+
+--Drop the functions if they already exist
+DROP FUNCTION IF EXISTS REGEX.MATCH
+GO
+DROP FUNCTION IF EXISTS REGEX.SUBSTRING
+GO
+DROP FUNCTION IF EXISTS REGEX.REPLACE
+GO
+
+DROP SCHEMA IF EXISTS REGEX;
+GO
+
+--Drop the assembly if it already exists
+DROP ASSEMBLY IF EXISTS SqlClrRegEx
+GO
+
+--Create the assembly
+CREATE ASSEMBLY SqlClrRegEx FROM '<#= this.Host.ResolvePath("bin\\Release\\SqlClrRegEx.dll") #>' WITH PERMISSION_SET = SAFE
+GO
+
+CREATE SCHEMA REGEX;
+GO
+
+--Create the functions
+CREATE FUNCTION REGEX.MATCH (@src NVARCHAR(MAX), @regex NVARCHAR(4000))
+RETURNS BIT
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledMatch
+GO
+CREATE FUNCTION REGEX.SUBSTRING (@src NVARCHAR(MAX), @regex NVARCHAR(4000))
+RETURNS NVARCHAR(4000)
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledSubstring
+GO
+CREATE FUNCTION REGEX.REPLACE (@src NVARCHAR(MAX), @regex NVARCHAR(MAX), @value NVARCHAR(4000))
+RETURNS NVARCHAR(MAX)
+AS EXTERNAL NAME SqlClrRegEx.RegEx.CompiledReplace
+GO