<?php $string = '--'; $doesNotMatchInPhp7 = '/(?|(---)|(-))\1$/'; $matchesInPhp7 = '/(?|(-)|(---))\1$/'; var_dump(preg_match($doesNotMatchInPhp7, $string)); var_dump(preg_last_error()); var_dump(preg_match($matchesInPhp7, $string));
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