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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Since 7.4.0, Group-Object cannot group strings containing curly braces","articleBody":"### Prerequisites\r\n\r\n- [X] Write a descriptive title.\r\n- [X] Make sure you are able to repro it on the [latest released version](https://github.com/PowerShell/PowerShell/releases)\r\n- [X] Search the existing issues.\r\n- [X] Refer to the [FAQ](https://github.com/PowerShell/PowerShell/blob/master/docs/FAQ.md).\r\n- [X] Refer to [Differences between Windows PowerShell 5.1 and PowerShell](https://learn.microsoft.com/powershell/scripting/whats-new/differences-from-windows-powershell).\r\n\r\n### Steps to reproduce\r\n\r\nSince 7.4.0, it appears that the `Group-Object` cmdlet tries to interpret its string input as .NET format strings.\r\n\r\nIf a string contains curly braces (U+007B and U+007D), the `Group-Object` cmdlet throws exceptions associated with the `[string]::Format` method or the `-f` operator.\r\n\r\n### Expected behavior\r\n\r\n```console\r\nPS\u003e '{' | Group-Object -NoElement;\r\n\r\nCount Name\r\n----- ----\r\n    1 {\r\n\r\nPS\u003e '}' | Group-Object -NoElement;\r\n\r\nCount Name\r\n----- ----\r\n    1 }\r\n```\r\n\r\n\r\n### Actual behavior\r\n\r\n```console\r\nPS\u003e '{' | Group-Object -NoElement;\r\nGroup-Object: Input string was not in a correct format. Failure to parse near offset 1. Expected an ASCII digit.\r\n\r\nPS\u003e '}' | Group-Object -NoElement;\r\nGroup-Object: Input string was not in a correct format. Failure to parse near offset 1. Unexpected closing brace without a corresponding opening brace.\r\n```\r\n\r\n\r\n### Error details\r\n\r\n```console\r\nException             : \r\n    Type       : System.FormatException\r\n    TargetSite : \r\n        Name          : ThrowFormatInvalidString\r\n        DeclaringType : System.ThrowHelper, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e\r\n        MemberType    : Method\r\n        Module        : System.Private.CoreLib.dll\r\n    Message    : Input string was not in a correct format. Failure to parse near offset 1. Unexpected closing brace without a corresponding opening brace.\r\n    Source     : System.Private.CoreLib\r\n    HResult    : -2146233033\r\n    StackTrace : \r\n   at System.Text.StringBuilder.AppendFormatHelper(IFormatProvider provider, String format, ReadOnlySpan`1 args)\r\n   at System.Text.StringBuilder.AppendFormat(IFormatProvider provider, String format, Object[] args)\r\n   at Microsoft.PowerShell.Commands.GroupInfo.BuildName(List`1 propValues)\r\n   at Microsoft.PowerShell.Commands.GroupInfo..ctor(OrderByPropertyEntry groupValue)\r\n   at Microsoft.PowerShell.Commands.GroupObjectCommand.DoOrderedGrouping(OrderByPropertyEntry currentObjectEntry, Boolean noElement, List`1 groups, Dictionary`2 groupInfoDictionary, OrderByPropertyComparer orderByPropertyComparer)\r\n   at Microsoft.PowerShell.Commands.GroupObjectCommand.EndProcessing()\r\n   at System.Management.Automation.CommandProcessorBase.Complete()\r\nCategoryInfo          : NotSpecified: (:) [Group-Object], FormatException\r\nFullyQualifiedErrorId : System.FormatException,Microsoft.PowerShell.Commands.GroupObjectCommand\r\nInvocationInfo        : \r\n    MyCommand        : Group-Object\r\n    ScriptLineNumber : 1\r\n    OffsetInLine     : 7\r\n    HistoryId        : 9\r\n    Line             : '}' | Group-Object -NoElement;\r\n    Statement        : Group-Object -NoElement\r\n    PositionMessage  : At line:1 char:7\r\n                       + '}' | Group-Object -NoElement;\r\n                       +       ~~~~~~~~~~~~~~~~~~~~~~~\r\n    InvocationName   : Group-Object\r\n    CommandOrigin    : Internal\r\nScriptStackTrace      : at \u003cScriptBlock\u003e, \u003cNo file\u003e: line 1\r\n```\r\n\r\n\r\n### Environment data\r\n\r\n```powershell\r\nName                           Value\r\n----                           -----\r\nPSVersion                      7.4.0\r\nPSEdition                      Core\r\nGitCommitId                    7.4.0\r\nOS                             Microsoft Windows 10.0.22631\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n\r\n\r\n### Visuals\r\n\r\n_No response_","author":{"url":"https://github.com/cschneegans","@type":"Person","name":"cschneegans"},"datePublished":"2023-11-17T02:49:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/20711/PowerShell/issues/20711"}