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run code in 300+ PHP versions simultaneously
<?php $b = preg_match('/\D/', '768486') !== 1; var_dump($b); $b = preg_match('/\D/', '768d486') !== 1; var_dump($b);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
bool(true) bool(false)

preferences:
107.02 ms | 410 KiB | 5 Q