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<?php var_dump(preg_match('{.[{}]{{}}.*}', 'foo42[ba]rl[]olZ+]qwZ]ry{{{}}df}gh', $m), $m);
based on pEHX9
Output for 4.3.0 - 7.1.0
int(1) array(1) { [0]=> string(11) "y{{{}}df}gh" }