<?php $re = '%^ ((?=x))? ((?=y))? (\w) $%mx'; $str = 'x y z'; preg_match_all($re, $str, $matches, PREG_SET_ORDER | PREG_UNMATCHED_AS_NULL, 0); // Print the entire match result var_dump($matches);
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Value for `_results` contains invalid data `array`