<?php
$pat = 'FR1920393874B1';
if (preg_match('~^([a-zA-Z]{2}\d+)(.*)~', $pat, $m)) { echo "Val: " . $m[1] . "\nKind: " . $m[2];
}
PD9waHAKCiRwYXQgPSAnRlIxOTIwMzkzODc0QjEnOwppZiAocHJlZ19tYXRjaCgnfl4oW2EtekEtWl17Mn1cZCspKC4qKX4nLCAkcGF0LCAkbSkpIHsKCWVjaG8gIlZhbDogIiAuICRtWzFdIC4gIlxuS2luZDogIiAuICRtWzJdOwp9