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// Test $in regular expressions with overlapping index bounds. SERVER-4677
t = db.jstests_inb;
t.drop();
function checkResults(query) {
assert.eq(4, t.count(query));
assert.eq(4, t.find(query).itcount());
}
t.ensureIndex({x: 1});
t.save({x: 'aa'});
t.save({x: 'ab'});
t.save({x: 'ac'});
t.save({x: 'ad'});
checkResults({x: {$in: [/^a/, /^ab/]}});
checkResults({x: {$in: [/^ab/, /^a/]}});
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