Private/Expand-EnvironmentVariables.ps1
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function Expand-EnvironmentVariables { <# .SYNOPSIS Expands ${VARNAME} in a string with the value of the environment variable VARNAME. .PARAMETER InputString The string to expand. .OUTPUTS [string] The expanded string. #> param( [Parameter(Mandatory)] [string]$InputString ) return $InputString -replace '\$\{([A-Za-z_][A-Za-z0-9_]*)\}', { $varName = $_.Groups[1].Value $envValue = [Environment]::GetEnvironmentVariable($varName) if ($envValue) { Write-VerboseMark -Message "Expanding environment variable $varName." return $envValue } else { Write-VerboseMark "Environment variable '$varName' is required but not set." return $null } } } |