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run code in 150+ php & hhvm versions
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<?php echo (!preg_match("/^[a-z-]+$/i", '4567')) ? 'false' : 'true'; echo "\n"; echo (!preg_match("/^[a-z-]+$/i", '4567A')) ? 'false' : 'true';
Output for 4.3.0 - 7.1.0
false false