A PHP script to rename a collection of Zettelkasten notes into a different format. I've used this script to rename my notes, so that the timestamp/ID is always at the front.

composer.json

{

    "require": {
        "illuminate/collections": "^8.26",
        "illuminate/support": "^8.26",
        "symfony/var-dumper": "^5.2"
    }
}

rename.php

<?php

use Illuminate\Support\Str;

require_once 'vendor/autoload.php';

$pattern = "/([A-z]*.*)(\ )(\d{1,14})(\.md)$/";

# Absolute path to where your notes are stored
$pathToNotes = '/Users/username/Library/Mobile Documents/iCloud~co~fluder~fsnotes/Documents/';

$directoryIterator = collect(new FilesystemIterator($pathToNotes))
    ->reject(function (SplFileInfo  $fileInfo) {
        return $fileInfo->isDir();
    })
    ->filter(function (SplFileInfo $fileInfo) {
        return $fileInfo->getExtension() == 'md';
    })
    ->filter(function (SplFileInfo  $fileInfo) use ($pattern) {

        preg_match($pattern, $fileInfo->getFilename(), $matches);

        if (count($matches) == 0) {
            return false;
        }

        [, , , $timestamp, ] = $matches;

        return $timestamp !== null;
    })
    ->each(function (SplFileInfo $fileInfo) use ($pathToNotes) {

        preg_match("/([A-z]*.*)(\ )(\d{1,14})(\.md)$/", $fileInfo->getFilename(), $matches);

        [, $title, , $timestamp, $extension] = $matches;
        
        
        # Update the order of the variables to what you want.
        $newFileName = "{$timestamp} {$title}{$extension}";

        var_dump(
            $fileInfo->getFilename(),
            $newFileName,
            '-------'
        );

        rename("{$pathToNotes}{$fileInfo->getFilename()}", "{$pathToNotes}{$newFileName}");

    });