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System.out.println("111111".replaceAll("/*", "2"));// 运行结果:2121212121212
匹配 匹配开始位置 长度
Match 1: 0 0
Match 2: 1 0
Match 3: 2 0
Match 4: 3 0
Match 5: 4 0
Match 6: 5 0
Match 7: 6 0
Match 1: 0 0
Match 2: 1 0
Match 3: 2 0
Match 4: 3 0
Match 5: 4 0
Match 6: 5 0
Match 7: 6 0