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run code in 300+ PHP versions simultaneously
<?php preg_match('/^[\w][\w-.]+@[\w-.]+\.[a-z]{2,4}$/U', abcde, $found); print_r($found);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "abcde" in /in/Ei8S6:2 Stack trace: #0 {main} thrown in /in/Ei8S6 on line 2
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant abcde - assumed 'abcde' (this will throw an Error in a future version of PHP) in /in/Ei8S6 on line 2 Warning: preg_match(): Compilation failed: invalid range in character class at offset 8 in /in/Ei8S6 on line 2
Output for 7.2.0 - 7.2.33
Warning: Use of undefined constant abcde - assumed 'abcde' (this will throw an Error in a future version of PHP) in /in/Ei8S6 on line 2 Array ( )
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Use of undefined constant abcde - assumed 'abcde' in /in/Ei8S6 on line 2 Array ( )

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