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function f(str) {
if (typeof str === 'string')
str = new RegExp(str);
for (var i = 0; i < 2000; i++)
str.test('foo');
}
f("abc");
function g(str) {
if (typeof str === 'string')
str = new RegExp(str);
for (var i = 0; i < 2000; i++)
str.exec('foo');
}
g("abc");