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<?php var_dump(preg_match($r = '[foo\\[[\\d\\s]+\\]]', 'lorem foo[42 37 19 ] ipsum', $m), $m); echo "$r\n";
Output for git.master, git.master_jit, rfc.property-hooks
int(1) array(1) { [0]=> string(14) "foo[42 37 19 ]" } [foo\[[\d\s]+\]]

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