Java 为什么我不能用美元符号拆分字符串？
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Why can't I split a string with the dollar sign?
提问by JGC
I want to split a string which has content like this:
我想拆分一个包含如下内容的字符串：
a$b$c
but when I use:
但是当我使用：
String data=...
data.split("$");
it does not recognize $ and do not split string but when I replace $ by some Letter like X it works. does anyone has any Idea?
它不识别 $ 并且不拆分字符串，但是当我用一些像 X 这样的字母替换 $ 时，它可以工作。有没有人有任何想法？
采纳答案by aperkins
The split function takes a regular expression, not a string, to match. Your regular expression uses a special character - in this case '$' - so you would need to change it to escape that character:
split 函数采用正则表达式而不是字符串进行匹配。您的正则表达式使用一个特殊字符 - 在本例中为 '$' - 因此您需要更改它以转义该字符：
String line = ...
String[] lineData = line.split("\$");
Also note that split returns an array of strings - Strings are immutable, so they cannot be modified. Any modifications made to the String will be returned in a new String, and the original will not be changed. Hence the lineData = line.split("\\$");above.
还要注意 split 返回一个字符串数组 - 字符串是不可变的，所以它们不能被修改。对 String 所做的任何修改都将在新的 String 中返回，并且不会更改原始字符串。因此lineData = line.split("\\$");以上。
回答by tangens
split()uses a regular expression as parameter. You have to call split( "\\$" ), because $is the regular expression for "end of line".
split()使用正则表达式作为参数。您必须调用split( "\\$" )，因为$是“行尾”的正则表达式。
回答by David
String.split() in Java takes a String argument which is a regular expression. The '$' character in a regex means the end of a line. You can use an escape sequence ("\\$") if you are looking for a dollar sign in the string.
Java 中的 String.split() 接受一个 String 参数，它是一个正则表达式。正则表达式中的“$”字符表示一行的结束。如果要在字符串中查找美元符号，可以使用转义序列 ("\\$")。
Sources:
资料来源：
String- Java API
字符串- Java API
Pattern- Java API
模式- Java API
回答by sepp2k
$ is a special character in regular expressions representing the end of the line. To match a dollar sign, use "\\$".
$ 是正则表达式中表示行尾的特殊字符。要匹配美元符号，请使用"\\$".
回答by Andrea Zilio
The split method accept a String as the first parameter that is then interpreted as a Regular Expression.
split 方法接受一个字符串作为第一个参数，然后将其解释为正则表达式。
The dollar sign is a specific operator in regular expressions and so you have to escape it this way to get what you want:
美元符号是正则表达式中的特定运算符，因此您必须以这种方式对其进行转义才能获得所需的内容：
String data = ...
String[] parts = data.split("\$");
Or, if the delimiter may change you can be more general this way:
或者，如果分隔符可能会改变，您可以通过这种方式更通用：
String data = ...
String[] parts = data.split(java.util.regex.Pattern.quote("$"));
回答by jake_astub
You may have an issue with the uniCode characters for non-breaking spaces. Try...
对于不间断空格的 uniCode 字符，您可能会遇到问题。尝试...
String[] elements = myString.split("[\s\xA0]+"); //include uniCode non-breaking
