MSBuild AutoVersion using Regex

autoVersion.csproj

<!-- reference: https://stackoverflow.com/questions/2982559/extract-number-from-string-in-msbuild -->
<!-- source: https://gist.github.com/theTonyHo/e346d59a886433cccd990800f1cefceb -->
  <Target Name="NugetPackAutoVersioning" AfterTargets="Build">
    <PropertyGroup Condition=" '$(AssemblyVersion)'=='' ">
        <AssemblyInfo>$(MSBuildProjectDirectory)\Properties\AssemblyInfo.cs</AssemblyInfo>
        <AssemblyInfoContent>$([System.IO.File]::ReadAllText('$(AssemblyInfo)'))</AssemblyInfoContent>
        <Pattern>\[assembly: AssemblyVersion\("(\d+.\d+.\d+.\d+)</Pattern>
        <AssemblyVersion>$([System.Text.RegularExpressions.Regex]::Match($(AssemblyInfoContent), $(Pattern), System.Text.RegularExpressions.RegexOptions.Multiline).Groups[1].Value) (From $(AssemblyInfo))</AssemblyVersion>
    </PropertyGroup>
    <PropertyGroup>
      <In>$(AssemblyVersion)</In>
      <Major>$([System.Text.RegularExpressions.Regex]::Match($(In), `(\d+).(\d+).(\d+).(\d+)`).Groups[1].Value)</Major>
      <Minor>$([System.Text.RegularExpressions.Regex]::Match($(In), `(\d+).(\d+).(\d+).(\d+)`).Groups[2].Value)</Minor>
      <Patch>$([System.Text.RegularExpressions.Regex]::Match($(In), `(\d+).(\d+).(\d+).(\d+)`).Groups[3].Value)</Patch>
      <BuildCounter Condition="'$(BuildCounter)'==''">0</BuildCounter>
      <BuildNumber Condition="'$(BuildNumber)'==''">$([System.DateTime]::Now.ToString("yyMMdd"))</BuildNumber>
      <PackageVersion>$(Major).$(Minor).$(BuildNumber).$(BuildCounter)</PackageVersion>
      <BuildSuffix  Condition="'$(BuildSuffix)'==''">wip</BuildSuffix>
      <BuildSuffix>$([MSBuild]::Escape($(BuildSuffix.Replace('/', '-').Replace('\', '-').Replace('=', '-').Replace('_', '-'))))</BuildSuffix>
    </PropertyGroup>
    <Message Text="Found AssemblyVersion: $(AssemblyVersion)" Importance="High" />
    <Message Text="Auto PackageVersion: $(PackageVersion)" Importance="High" />
    <Exec Command="nuget pack -Version $(PackageVersion) -Suffix $(BuildSuffix) -Properties Configuration=$(Configuration) " />
  </Target>