Regular matching operation 1-2 * ((+ 60-30 (- 40.0 / 5) * (9-2 * 5/3 + 7/3 * 99/10 * 4 * 2998 + 568/14)) - (- 4 * 3) / (16-3 * 2))

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Origin www.cnblogs.com/huangjiangyong/p/10926920.html