Get-Content using Regex on the filename + content - regex

Question

I want to print the ouput of a file matching a regex (Get-Content), with the concern that I'm looking (Get-ChildItem) the File using Regex too.
-File example:
ITOPS_Log [2022-06-18].txt
-File content:QQQ-9999999-QQQ
#Find the File using Regex:
$folder = "C:\Users\Eddy\Desktop"
$valid_files = Get-ChildItem $folder| Where-Object { $_.Name -match 'ITOPS_Log.\[\d{4}-\d{2}-\d{2}\].txt' }
Write-Output $valid_files
#Read the file and print content.
Foreach ($file in $valid_files) {
$content = (Get-Content $file.FullName)
ForEach ($line in $content) {
Write-Output "$line"
}
}
Output:
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 22/06/2022 16:11 64 ITOPS_Log [2022-06-18].txt
Get-Content : An object at the specified path C:\Users\Eddy\Desktop\ITOPS_Log [2022-06-18].txt does not exist, or has been filtered by the -Include or -Exclude parameter.
At C:\Users\Eddy\Desktop\Itops_Log_test_V2.ps1:15 char:25
+ $content = (Get-Content $file.FullName)
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (System.String[]:String[]) [Get-Content], Exception
+ FullyQualifiedErrorId : ItemNotFound,Microsoft.PowerShell.Commands.GetContentCommand
I know I'm not using Regex to match with the content if only want the number. But I got stuck already without filters and I need to solve this first and then apply regex to match the digits.
How can I print the ouput of the File with this code? I don't understand what I'm missing.

Answer 1

Continuing from my comment, The -Path parameter on Get-ChildItem and Get-Content tries to resolve wildcard characters and because your file has square brackets, it sees that as a range of characters or numbers.
To avoid that, use -LiteralPath instead so nothing in the path gets interpreted.
Then to test if the file has something resembling a date inside those square brackets, I would use an anchored regex on the file's BaseName property:
#Find the File using Regex:
$folder = "C:\Users\Eddy\Desktop"
$valid_files = Get-ChildItem -LiteralPath $folder -Filter 'ITOPS_Log*.txt' -File |
Where-Object { $_.BaseName -match '\[\d{4}-\d{2}-\d{2}\]$' }
# show the found files on screen
$valid_files
#Read the file and print content.
foreach ($file in $valid_files) {
$content = (Get-Content -LiteralPath $file.FullName)
foreach ($line in $content) {
Write-Host $line
# or just the number?
Write-Host ([regex]'(\d+)').Match($line).Groups[1].Value
}
}
Regex details on the file's BaseName (--> File Name without extension):
\[ Match the character “[” literally
\d Match a single digit 0..9
{4} Exactly 4 times
- Match the character “-” literally
\d Match a single digit 0..9
{2} Exactly 2 times
- Match the character “-” literally
\d Match a single digit 0..9
{2} Exactly 2 times
\] Match the character “]” literally
$ Assert position at the end of the string (or before the line break at the end of the string, if any)

Answer 2

#Find the File using Regex:
$folder = "C:\Users\Eddy\Desktop"
$valid_files = Get-ChildItem $folder| Where-Object { $_.Name -match 'ITOPS_Log.\[\d{4}-\d{2}-\d{2}\].txt' }
Write-Output $valid_files
Write-Output $valid_files
#Read the file and print content.
Foreach ($file in $valid_files) {
$content = (Get-Content -LiteralPath $folder\$file)
ForEach ($line in $content) {
Write-Output "$line"
}
}