遇到.split（“\\”）方法有问题。 [英] Having trouble with a .split("\\") method.

问题描述

再次问好。我正在尝试将ArrayList< String>作为输入。并利用String的.spit（分隔符）方法将其转换为String [] []。我收到了一些错误（我会发布代码并将错误降低）。


这里有一个简单的例子：

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解决方案

您需要四个反斜杠来匹配\，因为它是一个特殊的特殊字符。

您需要四个反斜杠来匹配\，因为它是一个特殊的特殊字符。

只是详细说明r025198x的非常正确和非常简洁的回复：


假设你要拆分单反斜杠;你必须用

另一个反斜杠来逃避它（因为r035198x已经正确写了），反斜杠

是正则表达式编译器的一个特殊字符。


如果要将该正则表达式作为文字字符串提供，则必须通过Java编译器获得

，但javac认为反斜杠字符为

特殊字符，所以基本上你想得到两个反斜杠

javac;每个需要一个额外的反斜杠：

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只是详细说明r025198x的非常正确和非常简洁的回复：


假设你想要拆分一个反斜杠;你必须用

另一个反斜杠来逃避它（因为r035198x已经正确写了），反斜杠

是正则表达式编译器的一个特殊字符。


如果要将该正则表达式作为文字字符串提供，则必须通过Java编译器获得

，但javac认为反斜杠字符为

特殊字符，所以基本上你想得到两个反斜杠

javac;每个需要一个额外的反斜杠：

展开 | 选择 | Wrap | 行号

Hello again. I''m trying to take as an input an ArrayList<String> and utilize String''s .spit(delimiter) method to turn that into a String[][]. I''m getting some kind of error though (I''ll post the code and error lower down).

Here''s a simple example:

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解决方案

You need four backslashes to match \ because it is a special-special character.

You need four backslashes to match \ because it is a special-special character.

Just to elaborate on r025198x''s awfully correct and awfully terse reply:

Suppose you want to split on a single backslash; you have to escape it with
another backslash because (as r035198x already correctly wrote), the backslash
is a special character for the regular expression compiler.

If you want to supply that regular expression as a literal String, you have to get
it past the Java compiler too but javac considers a backslash character as a
special character as well, so basically you want to get two backslashes past
javac; that takes one extra backslash each:

Expand|Select|Wrap|Line Numbers

Just to elaborate on r025198x''s awfully correct and awfully terse reply:

Suppose you want to split on a single backslash; you have to escape it with
another backslash because (as r035198x already correctly wrote), the backslash
is a special character for the regular expression compiler.

If you want to supply that regular expression as a literal String, you have to get
it past the Java compiler too but javac considers a backslash character as a
special character as well, so basically you want to get two backslashes past
javac; that takes one extra backslash each:

Expand|Select|Wrap|Line Numbers

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