PowerShell I want to cut off a string after a specific character sequence

I am trying to parse a string variable where everything after -354 gets cut off.

I have variables that look like this: NameOfFile-354-XX.pdf

Where NameOfFile can be any length and -XX can be anything or not even there at all.

I want the print of this variable to be: NameOfFile-354

How do I cut the variable so it cuts after -354?

What I have tried so far:

$FileArray = @("Name1-354-03.pdf", "Name23-354-H11.pdf", "Name354-354-02.pdf", "Name3545-354.pdf")
ForEach ($n in $FileArray){
     Write-Host $n.Substring(0, $n.lastIndexOf('-354'))
}

I want the output to be this:

Name1-354
Name23-354
Name354-354
Name3545-354

Thank you for your help.

>Solution :

I am not a regex pro but would something like this work for you?

$string = "NameOfFile-354-XX.pdf"
$regex = "(.*)(-[a-zA-Z0-9]+(.)(.*))"
$match = $string -replace $regex,'$1'

Output would be like this:

PS C:\temp> $string = "NameOfFile-354-XX.pdf"
$regex = "(.*)(-[a-zA-Z0-9]+(.)(.*))"
$match = $string -replace $regex,'$1'

Write-Host $match
NameOfFile-354

PS C:\temp> 

Regex details: https://regex101.com/r/Fw8F3i/1