PowerShell脚本如何使用两个自定义掩码筛选指定格式PDF文件？

Since the -Filter parameter in Get-ChildItem only supports simple wildcard patterns (like *TEXT-TXT-*), we need to use regular expressions (regex) to match your specific, structured filename masks. Here's how to implement this in PowerShell:

Step-by-Step Explanation & Script #

First, let's translate your two filename masks into regex patterns:

• Mask 1: ##-##-#### XXXX-XXX-XXXX-XX.PDF → Digits for #, non-digits for X
• Mask 2: ##-##-#### XXXX-XXX-XXX-XXXX-XX.PDF → Same date prefix, longer non-digit segment

Full Script #

# Set your target folder path
$targetPath = "C:\Path\To\Your\PDF\Folder"

# Define the regex pattern that matches both filename masks
$filenameRegex = '^\d{2}-\d{2}-\d{4} (?:[^\d]{4}-[^\d]{3}-[^\d]{4}-[^\d]{2}|[^\d]{4}-[^\d]{3}-[^\d]{3}-[^\d]{4}-[^\d]{2})\.PDF$'

# Get all PDF files, filter using the regex, then process each match
Get-ChildItem -Path $targetPath -Filter "*.PDF" -Recurse -Force |
    Where-Object { $_.Name -match $filenameRegex } |
    ForEach-Object {
        # Replace this with your actual后续 steps (processing the PDF)
        Write-Host "Processing matching file: $($_.FullName)"
        
        # Example actions you could add:
        # - Extract text from the PDF
        # - Copy/move the file to another location
        # - Run a third-party tool on the file
    }

Regex Pattern Breakdown #

Let's unpack the regex so you understand exactly how it works:

• ^: Anchors the match to the start of the filename (prevents partial matches, like a valid prefix in a longer filename)
• \d{2}-\d{2}-\d{4}: Matches the date segment (##-##-####) where \d represents any digit, and {n} means exactly n occurrences
• : Matches the space separating the date and non-digit segments
• (?:...|...): A non-capturing group that lets us match either of the two non-digit structures:
  • First option: [^\d]{4}-[^\d]{3}-[^\d]{4}-[^\d]{2} → Matches XXXX-XXX-XXXX-XX ([^\d] = any non-digit character)
  • Second option: [^\d]{4}-[^\d]{3}-[^\d]{3}-[^\d]{4}-[^\d]{2} → Matches XXXX-XXX-XXX-XXXX-XX
• \.PDF$: Anchors the match to the end of the filename, ensuring it ends with .PDF (PowerShell's -match is case-insensitive by default, so .pdf will also match)

Key Tips #

• Using -Filter "*.PDF" first narrows down the files to only PDFs, making the regex check more efficient than scanning every file in the folder.
• If you need strict case sensitivity for the .PDF extension, replace -match with -cmatch (case-sensitive match).
• If X should only be letters (not symbols), replace [^\d] with [A-Za-z] in the regex.

内容的提问来源于stack exchange，提问作者Sunfile