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<?php preg_match( '#^AH\d{6}$#', AH587910); echo $matches[1]; // 1234
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 "AH587910" in /in/VkC7S:2 Stack trace: #0 {main} thrown in /in/VkC7S on line 2
Process exited with code 255.
Output for 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Warning: Use of undefined constant AH587910 - assumed 'AH587910' (this will throw an Error in a future version of PHP) in /in/VkC7S on line 2 Notice: Undefined variable: matches in /in/VkC7S on line 3 Notice: Trying to access array offset on value of type null in /in/VkC7S on line 3
Output for 7.3.32 - 7.3.33, 7.4.26
Warning: Use of undefined constant AH587910 - assumed 'AH587910' (this will throw an Error in a future version of PHP) in /in/VkC7S on line 2
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Warning: Use of undefined constant AH587910 - assumed 'AH587910' (this will throw an Error in a future version of PHP) in /in/VkC7S on line 2 Notice: Undefined variable: matches in /in/VkC7S on line 3
Output for 5.0.4 - 5.0.5, 5.1.1 - 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
Notice: Use of undefined constant AH587910 - assumed 'AH587910' in /in/VkC7S on line 2 Notice: Undefined variable: matches in /in/VkC7S on line 3
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/VkC7S on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Use of undefined constant AH587910 - assumed 'AH587910' in /in/VkC7S on line 2 Notice: Undefined variable: matches in /in/VkC7S on line 3

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270.31 ms | 402 KiB | 374 Q