Private/Test-IsGuid.ps1
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<#
.SYNOPSIS Tests if a given string is a valid GUID (Globally Unique Identifier). .DESCRIPTION This function checks if the provided string matches the standard GUID format using a regular expression. .PARAMETER GuidString Specifies the string to check for GUID format validity. The string should be a valid GUID. .OUTPUTS System.Boolean Returns $true if the string is a valid GUID, otherwise returns $false. .EXAMPLE PS C:\> Test-IsGuid -GuidString "123e4567-e89b-12d3-a456-426614174000" Checks if the string "123e4567-e89b-12d3-a456-426614174000" is a valid GUID. Returns $true. .EXAMPLE PS C:\> Test-IsGuid -GuidString "{123e4567-e89b-12d3-a456-426614174000}" Checks if the string "{123e4567-e89b-12d3-a456-426614174000}" is a valid GUID. Returns $true. .EXAMPLE PS C:\> Test-IsGuid -GuidString "invalid-guid-string" Checks if the string "invalid-guid-string" is a valid GUID. Returns $false. #> function Test-IsGuid { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [System.String]$GuidString ) process { $guidRegex = '^(\{){0,1}[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}(\}){0,1}$' Write-Output -InputObject ($GuidString -match $guidRegex) } } |