// @tags: [requires_fastcount]

let t = db.regex2;
t.drop();

assert.commandWorked(t.save({a: "test"}));
assert.commandWorked(t.save({a: "Test"}));

assert.eq(2, t.find().count(), "A");
assert.eq(1, t.find({a: "Test"}).count(), "B");
assert.eq(1, t.find({a: "test"}).count(), "C");
assert.eq(1, t.find({a: /Test/}).count(), "D");
assert.eq(1, t.find({a: /test/}).count(), "E");
assert.eq(2, t.find({a: /test/i}).count(), "F");

t.drop();

let a = "\u0442\u0435\u0441\u0442";
let b = "\u0422\u0435\u0441\u0442";

assert((new RegExp(a)).test(a), "B 1");
assert(!(new RegExp(a)).test(b), "B 2");
assert((new RegExp(a, "i")).test(b), "B 3 ");

assert.commandWorked(t.save({a: a}));
assert.commandWorked(t.save({a: b}));

assert.eq(2, t.find().count(), "C A");
assert.eq(1, t.find({a: a}).count(), "C B");
assert.eq(1, t.find({a: b}).count(), "C C");
assert.eq(1, t.find({a: new RegExp(a)}).count(), "C D");
assert.eq(1, t.find({a: new RegExp(b)}).count(), "C E");
assert.eq(
    2, t.find({a: new RegExp(a, "i")}).count(), "C F is spidermonkey built with UTF-8 support?");

// same tests as above but using {$regex: "a|b", $options: "imx"} syntax.
t.drop();

assert.commandWorked(t.save({a: "test"}));
assert.commandWorked(t.save({a: "Test"}));

assert.eq(2, t.find().count(), "obj A");
assert.eq(1, t.find({a: {$regex: "Test"}}).count(), "obj D");
assert.eq(1, t.find({a: {$regex: "test"}}).count(), "obj E");
assert.eq(2, t.find({a: {$regex: "test", $options: "i"}}).count(), "obj F");
assert.eq(2,
          t.find({a: {$options: "i", $regex: "test"}}).count(),
          "obj F rev");  // both orders should work

t.drop();

a = "\u0442\u0435\u0441\u0442";
b = "\u0422\u0435\u0441\u0442";

assert.commandWorked(t.save({a: a}));
assert.commandWorked(t.save({a: b}));

assert.eq(1, t.find({a: {$regex: a}}).count(), "obj C D");
assert.eq(1, t.find({a: {$regex: b}}).count(), "obj C E");
assert.eq(2,
          t.find({a: {$regex: a, $options: "i"}}).count(),
          "obj C F is spidermonkey built with UTF-8 support?");

// Test s (DOT_ALL) option. Not supported with /regex/opts syntax
t.drop();
assert.commandWorked(t.save({a: '1  2'}));
assert.commandWorked(t.save({a: '1\n2'}));
assert.eq(1, t.find({a: {$regex: '1.*2'}}).count());
assert.eq(2, t.find({a: {$regex: '1.*2', $options: 's'}}).count());
