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run code in 150+ php & hhvm versions
Bugs & Features
<?php $value = '2010'; //$pattern = '(\d{4}(-\d{2})?(-\d{2})?( \d{2})?(:\d{2})?(:\d{2})?)'; $pattern = '^[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}(:\d{2})?)]+$'; var_dump(preg_match('/' . $pattern . '/', $value));
Output for 5.4.41 - 5.4.45, 5.5.10 - 7.1.0
Warning: preg_match(): Compilation failed: invalid range in character class at offset 10 in /in/ZcNat on line 9 bool(false)
Output for 4.3.0 - 5.4.40, 5.5.0 - 5.5.9
int(1)