Java's replaceAll() method escapes special characters-Java-php.cn

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Java's replaceAll() method escapes special characters

王林

Feb 22, 2024 pm 01:31 PM

php小编鱼仔带来了一篇关于Java中replaceAll()方法转义特殊字符的问答文章。Java中的replaceAll()方法是用于替换字符串中的指定字符或字符序列，但在处理特殊字符时可能会出现一些问题。本文将解答如何正确转义特殊字符以及避免一些常见的错误，帮助读者更好地理解和应用这个方法。

问题内容

我正在使用 java replaceall() 方法来转义换行符

string comment = "ddnfa \n  \r \tdnfadsf ' \r t  ";
comment = comment.replaceall("(\\n|\\r|\\t)","\\\\$1");
system.out.println(comment);

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但是上面的代码仍然插入新行。

有没有办法输出完全相同的注释（即使用 \n 和 \r 而不是插入新行）？

更新：

我最终使用：

comment = comment.replaceAll("\\n","\\\\n")
                 .replaceAll("\\r","\\\\r")
                 .replaceAll("\\t","\\\\t");

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解决方法

您必须逐一进行，因为换行符 u+000a 与两个字符转义序列 \n 无关：

comment = comment.replaceAll("\n","\\\\n");
comment = comment.replaceAll("\r","\\\\r");
comment = comment.replaceAll("\t","\\\\t");

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