Regular search, find duplicate content, such as the 11-digit number from txt

txt\Backup\Form1.cs
...\......\Form1.Designer.cs
...\......\Form1.resx
...\......\Program.cs
...\......\...perties\AssemblyInfo.cs
...\......\..........\Resources.Designer.cs
...\......\..........\Resources.resx
...\......\..........\Settings.Designer.cs
...\......\..........\Settings.settings
...\......\ReadPhoneNumber.csproj
...\......\ReadPhoneNumber.sln
...\bin\Debug\ReadPhoneNumber.exe
...\...\.....\ReadPhoneNumber.pdb
...\...\.....\ReadPhoneNumber.vshost.exe
...\...\.....\ReadPhoneNumber.vshost.exe.manifest
...\Form1.cs
...\Form1.Designer.cs
...\Form1.resx
...\obj\Debug\ReadPhoneNumber.csproj.FileListAbsolute.txt
...\...\.....\ReadPhoneNumber.csproj.GenerateResource.Cache
...\...\.....\ReadPhoneNumber.exe
...\...\.....\ReadPhoneNumber.Form1.resources
...\...\.....\ReadPhoneNumber.pdb
...\...\.....\ReadPhoneNumber.Properties.Resources.resources
...\...\.....\TempPE\Properties.Resources.Designer.cs.dll
...\...\ReadPhoneNumber.csproj.FileList.txt
...\...\ReadPhoneNumber.csproj.FileListAbsolute.txt
...\Program.cs
...\...perties\AssemblyInfo.cs
...\..........\Resources.Designer.cs
...\..........\Resources.resx
...\..........\Settings.Designer.cs
...\..........\Settings.settings
...\ReadPhoneNumber.csproj
...\ReadPhoneNumber.csproj.user
...\ReadPhoneNumber.sln
...\ReadPhoneNumber.suo
...\ReadPhoneNumber_TemporaryKey.pfx
...\UpgradeLog.XML
...\_UpgradeReport_Files\UpgradeReport.css
...\....................\UpgradeReport.xslt
...\....................\UpgradeReport_Minus.gif
...\....................\UpgradeReport_Plus.gif
...\obj\Debug\TempPE
...\Backup\Properties
...\bin\Debug
...\obj\Debug
...\Backup
...\bin
...\obj
...\Properties
...\_UpgradeReport_Files
txt

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