Soenneker.Normalizers.Ein 4.0.209

Prefix Reserved
.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. 
dotnet add package Soenneker.Normalizers.Ein --version 4.0.209
                    


                    

                
NuGet\Install-Package Soenneker.Normalizers.Ein -Version 4.0.209
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Soenneker.Normalizers.Ein" Version="4.0.209" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Soenneker.Normalizers.Ein" Version="4.0.209" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Soenneker.Normalizers.Ein" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Soenneker.Normalizers.Ein --version 4.0.209
                    


                    

                
#r "nuget: Soenneker.Normalizers.Ein, 4.0.209"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Soenneker.Normalizers.Ein@4.0.209
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Soenneker.Normalizers.Ein&version=4.0.209
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Soenneker.Normalizers.Ein&version=4.0.209
                    


                            Install as a Cake Tool

Soenneker.Normalizers.Ein

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Extracts nine ASCII digits from user input and formats them as XX-XXXXXXX.

Installation

dotnet add package Soenneker.Normalizers.Ein

Registration

using Soenneker.Normalizers.Ein.Registrars;

builder.Services.AddEinNormalizerAsSingleton();
// or: builder.Services.AddEinNormalizerAsScoped();

The implementation has no mutable per-call state and can be shared as a singleton.

Usage

using Soenneker.Normalizers.Ein.Abstract;

string? normalized = normalizer.Normalize("12 345 6789");
// "12-3456789"

Behavior is intentionally narrow:

Input Result
123456789 12-3456789
12-3456789 12-3456789
abc12.345.6789xyz 12-3456789
12345678 null
1234567890 null
null, empty, or whitespace null

Non-ASCII digits do not count. Non-numeric characters are ignored, the original input must be between 9 and 20 characters, and the result is null unless exactly nine digits remain.

This is formatting, not EIN verification. It does not validate IRS prefix assignments, confirm that an EIN was issued, or establish that the identifier belongs to an organization. Perform any required business verification separately.

EINs are sensitive identifiers. Avoid logging raw or normalized values, and apply appropriate access controls and retention rules when storing them.

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
4.0.209 0 8/31/2026
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4.0.207 22 8/30/2026
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Update dependency Soenneker.Extensions.String to 4.0.734 (#718)