Public/Test-PdqVariableName.ps1
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<#
.SYNOPSIS Determines whether a Variable is Custom, System, or "Bare". .NOTES "Bare" is my term for a Variable name that doesn't have the Custom or System formatting characters. .INPUTS None. .OUTPUTS System.String .EXAMPLE Test-PdqVariableName -Name 'Date' Bare .EXAMPLE Test-PdqVariableName -Name '@(Date)' Custom .EXAMPLE Test-PdqVariableName -Name '$(Date)' System #> function Test-PdqVariableName { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] # The Variable name you would like to examine. [String]$Name ) switch ($Name) { # Starts with @( # Contains 1 or more of any character, except for these: ()@$ # Ends with ) {$_ -match '^@\([^()@$]+\)$'} { 'Custom' break } # Starts with $( # Contains 1 or more of any character, except for these: ()@$ # Ends with ) {$_ -match '^\$\([^()@$]+\)$'} { 'System' break } # Contains 1 or more of any character, except for these: ()@$ {$_ -match '^[^()@$]+$'} { 'Bare' break } default { throw "'$_' does not match the Variable naming convention." } } } |