Regex — Match und Extraktion

<?php

declare(strict_types=1);

$text = 'Kontakt: anna@example.com, ben@site.de';

// Alle E-Mails extrahieren
if (preg_match_all('/[\w.+-]+@[\w.-]+\.[a-z]{2,}/i', $text, $matches)) {
    foreach ($matches[0] as $email) {
        echo $email . "\n";
    }
}

// Mit Named Groups
if (preg_match('#(?<jahr>\d{4})-(?<monat>\d{2})-(?<tag>\d{2})#', '2026-09-18', $m)) {
    echo "{$m['tag']}.{$m['monat']}.{$m['jahr']}";
}

// Ersetzen mit Callback
$masked = preg_replace_callback(
    '/\b(\d{3})(\d+)\b/',
    fn($m) => $m[1] . str_repeat('*', strlen($m[2])),
    'Karte: 1234567890'
);