<?php $noAcronyms = 'oneTwoThreeFour'; var_export(preg_split('~^[^A-Z]+\K|[A-Z][^A-Z]+\K~', $noAcronyms, 0, PREG_SPLIT_NO_EMPTY)); echo "\n---\n"; var_export(preg_match_all('~[A-Z]?[^A-Z]+~', $noAcronyms, $out) ? $out[0] : []);
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