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<?php var_dump(preg_match('#^"(\S+)":"(\S+)":private\z#', '"e":"Y":private', $m),$m);
Output for 4.3.0 - 7.1.0
int(1) array(3) { [0]=> string(15) ""e":"Y":private" [1]=> string(1) "e" [2]=> string(1) "Y" }