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When a backward greedy loop backtracked toward the right edge of the input, the optimized scan for a following Char instruction could stop making progress at end of input and loop forever. This made patterns like /(?<=a.?)/ hang on non-matching input.
9 lines
265 B
JavaScript
9 lines
265 B
JavaScript
test("greedy lookbehind backtracking makes progress at end of input", () => {
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expect(/(?<=a.?)/.exec("b")).toBeNull();
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let match = /(?<=a.?)/.exec("ab");
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expect(match).not.toBeNull();
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expect(match[0]).toBe("");
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expect(match.index).toBe(1);
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});
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