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如何在 Java-8 正则表达式中使用 R
\R 与 Unicode 标准中定义的任何换行符相符
Pattern p = Pattern.compile("\R");
Unicode 换行序列等同于 \u000D\u000A|[\u000A\u000B\u000C\u000D\u0085\u2028\u2029]
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