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

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