PowerShell example of getting parameter names from the script file with a regex for each parameter

ParamsFromScriptFileName.ps1

#
# Get parameter values from the script file name.
#
$validparam1s= "Value1|Value2|Value3"
$param1PatternInFileName = "[^ \.]+(?=\.ps1$)"
$param1= (select-string -Pattern $param1PatternInFileName -InputObject $MyInvocation.MyCommand.Name).Matches.Value
if(-not( $param1 -match $validparam1s))
{
    throw "$($MyInvocation.MyCommand.Name) does not end with a valid param1 name. Expected one of $validparam1s."
}

$validparam2s= 1,2
$param2PatternInFileName = "(?<=Step )(\d)(?=.+\.ps1$)"
$param2= (select-string -Pattern $param2PatternInFileName -InputObject $MyInvocation.MyCommand.Name).Matches.Value

if(-not( $validparam2s -contains $param2))
{
    throw "$($MyInvocation.MyCommand.Name) does not name a valid param2. Expected 'Step 1 ' or 'Step 2 '"
}
#----------------------------------------------------------

$script= Join-Path (split-path -parent $MyInvocation.MyCommand.Definition) "Script.ps1"
& "$script" -param1 "$param1" -param2 $param2

#----------------------------------------------------------
# Or:
function actualFunction($p1, $p2){
 # ...
}
actualFunction $param1 $param2

Originally written for deployment scripts, where the main parameter is an environment name