Directory.Build.targets

<Project>

  <PropertyGroup>
    <MSBuildTaskDllPath Condition="'$(MSBuildRuntimeType)' == 'Full'">$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll</MSBuildTaskDllPath>
    <MSBuildTaskDllPath Condition="'$(MSBuildRuntimeType)' == 'Core'">$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll</MSBuildTaskDllPath>
    <MSBuildTaskFactory Condition="'$(MSBuildRuntimeType)' == 'Full'">CodeTaskFactory</MSBuildTaskFactory>
    <MSBuildTaskFactory Condition="'$(MSBuildRuntimeType)' == 'Core'">RoslynCodeTaskFactory</MSBuildTaskFactory>
  </PropertyGroup>
  <UsingTask TaskName="ReplaceFileText" TaskFactory="$(MSBuildTaskFactory)" AssemblyFile="$(MSBuildTaskDllPath)">
    <ParameterGroup>
      <InputFilename ParameterType="System.String" Required="true" />
      <OutputFilename ParameterType="System.String" Required="true" />
      <MatchExpression ParameterType="System.String" Required="true" />
      <ReplacementText ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Using Namespace="System" />
      <Using Namespace="System.IO" />
      <Using Namespace="System.Text.RegularExpressions" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
              File.WriteAllText(OutputFilename,Regex.Replace(File.ReadAllText(InputFilename),MatchExpression,ReplacementText));
        ]]>
      </Code>
    </Task>
  </UsingTask>

</Project>