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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = '[a-z][0-9]'; var_dump(preg_match($a, 'test1'));
based on i0R54
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier '[' in /in/jUDRk on line 4 bool(false)
Output for hhvm-3.12.0
Warning: Unknown modifier '[': [[a-z][0-9]] in /in/jUDRk on line 4 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '[' in /in/jUDRk on line 4 bool(false)