3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo preg_match('^[a-z]{2}-[A-Z]{2}$', 'en-US');
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: preg_match(): No ending delimiter '^' found in /in/CC7tE on line 3

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200.35 ms | 403 KiB | 287 Q