// new RegExp("").exec("");

// /d+/.exec("abc");
null
// /d+/.exec("abc123");
123
// /ABC/i.exec("abc");
abc
// /.bar/s.exec("foo\nbar");

bar
She,,e
input She sells seashells by the seashore
index 0
lastIndex 3
seashells,sea,ells
input She sells seashells by the seashore
index 10
lastIndex 19
