Best way to ensure combinations from the ValidationSet parameter attribute are processed correctly in PowerShell without using multiple IF statements?

Question

I have an advanced function I have been working on that looks something like this:
Function Do-Something
[cmdletbinding()]
Param
[Parameter(Mandatory=$true,
[ValidateSet('Yes', 'No', 'Y', 'N', IgnoreCase = $true)]
[string[]]$Param1,
[Parameter(Mandatory=$true,
[ValidateSet('Yes', 'No', 'Y', 'N', IgnoreCase = $true)]
[string[]]$Param2,
[Parameter(Mandatory=$true,
[ValidateSet('Yes', 'No', 'Y', 'N', IgnoreCase = $true)]
[string[]]$Param3
Begin {}
Process
My question is, how do I get the values such as "Yes", "Y", "No", and "N" that's located in the [ValidateSet()] validation attribute processed correctly without having to use multiple "If" and "ElseIf"
statements. 
For instance, I want to avoid the following, because I know there is a faster and more efficient way (less typing) to do it:
If ($param1 -match "Yes" -or "Y" -and $param2 -match "Yes" -or "Y" -and $param3 -match "Yes" -or "Y")
#Do something here
ElseIf  ($param1 -match "No" -or "N" -and $param2 -match "Yes" -or "Y" -and $param3 -match "Yes" -or "Y")
#Do something
I was reading that splatting may help me here, but I am new to the splatting technique and need some help with this one.
I appreciate any help that anyone can offer. 
Thanks

Answer 1

Is this what you are trying to ask how to do?  Your posted script is written incorrectly and will not work at all. 
Function Do-Something{
[cmdletbinding()]
Param (
[Parameter(Mandatory=$true)]
[ValidateSet('Yes','No','Y','N')]
[string]$p1,
[Parameter(Mandatory=$true)]
[ValidateSet('Yes','No','Y','N')]
[string]$p2
Begin{
Process{
# parse the strings to booleans
$p1a=if($p1 -match 'Yes|Y'){$true}else{$false}
$p2a=if($p2 -match 'Yes|Y'){$true}else{$false}
if($p1a){Write-Host 'P1 is good' -ForegroundColor green}
if($p2a){Write-Host 'P2 is good' -ForegroundColor green}
if($p1a -and $p2a){
Write-Host 'All conditions met' -ForegroundColor green
}else{
Write-Host 'Conditions not met' -ForegroundColor red
PS C:\scripts> Do-Something Y n
P1 is good
Conditions not met
PS C:\scripts> Do-Something n n
Conditions not met
PS C:\scripts> Do-Something y y
P1 is good
P2 is good
All conditions met
This handles case and creates a tracking Boolean fo reach parameter so you can just build simple logic.
¯\_(ツ)_/¯