Regex & Substring() To Get Part of File Name

PowerShell Help
1

I have different types of files that all have the date in the filename (YY-MMDD), and I need to extract only the date portion and use for further execution (? = may or may not have character, depending on type of file):

?YY-MMDD?.???

The Split() method portion below works, but now I need to assign only the date portion to a variable and leave the other characters out. Though likely quite simple, I’ve tried many regex’s but my regex saw needs a lot of sharpening.

if ($FileName -match "\d{2}-\d{4}")
{
     $Label = $FileName.Split('.')[0]

     # assign date to variable here
}

Thank you for any help.

Aaron

2 
$test = @(
'16-0830.txt'
'randomtext16-0830.txt'
'16-0830randomtext.txt'
'randomtext16-0830randomtext.txt'
'1234516-083012345.txt'
)

ForEach($item in $test)
{
    If($item -match "(?'date'\d{2}-\d{4})")
    {
        "$item's date is $($Matches['date'])"
    }
    Else
    {
        "$item failed to match"
    }
}

Just need a capturing group.

3

If you were using get-childitem to get the file names, there isn’t a need to use the .split(). The returned object will come with a BaseName property that already has the file type extension removed.

4

Thanks Craig!

That’s exactly what was needed. You can see I was essentially missing (?‘date’\d{2}-\d{4}) - another simple fix.

Appreciate the help!

Aaron