3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(preg_match('{\bFirePHP/\d+\.\d+\b}', 'FirePHP/12345678901234567890123456789012345678901234567891234567890123456789123456789012345678901234567890123456789012345678912345678901234567891234567890123456789012345678901234567890123456789123456789012345678912345678901234567890123456789012345678901234567891234567890123456789.12345678901234567890123456789012345678901234567891234567890123456789123456789012345678901234567890123456789012345678912345678901234567891234567890123456789012345678901234567890123456789123456789012345678912345678901234567890123456789012345678901234567891234567890123456789a'));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
int(0)
preferences:
88.22 ms | 409 KiB | 5 Q