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The expression will only match from its `lastIndex` position and `ignores` the global (g) flag if set.


let reg = /^foo/y;

let reg2 = new RegExp(reg.source, 'my');

reg.test('foo');  //  false

reg.lastIndex = 1;

reg.test('\nfoo');  //  false

reg2.test('foo'); //  false;

reg2.lastIndex = 1;

reg2.test('\nfoo'); //  true