string 如何在 Scala 中按字符串拆分字符串
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How to split a string by a string in Scala
提问by Félix Saparelli
In Ruby, I did:
在 Ruby 中，我做了：
"string1::string2".split("::")
In Scala, I can't find how to splitusing a string, not a single character.
在 Scala 中，我找不到如何split使用字符串，而不是单个字符。
回答by Janx
The REPL is even easier than Stack Overflow. I just pasted your example as is.
REPL 甚至比 Stack Overflow 更容易。我只是按原样粘贴了您的示例。
Welcome to Scala version 2.8.1.final (Java HotSpot Server VM, Java 1.6.0_22).Type in expressions to have them evaluated.Type :help for more information.
Welcome to Scala version 2.8.1.final (Java HotSpot Server VM, Java 1.6.0_22).Type in expressions to have them evaluated.Type :help for more information.
scala> "string1::string2".split("::")
res0: Array[java.lang.String] = Array(string1, string2)
回答by Moritz
In your example it does not make a difference, but the String#splitmethod in Scala actually takes a Stringthat represents a regular expression. So be sure to escape certain characters as needed, like e.g. in "a..b.c".split("""\.\.""")or to make that fact more obvious you can call the split method on a RegEx: """\.\.""".r.split("a..b.c").
在您的示例中，它没有任何区别，但String#splitScala 中的方法实际上采用String表示正则表达式的 a 。所以一定要根据需要对某些字符进行转义，例如 in"a..b.c".split("""\.\.""")或者为了使这一事实更加明显，您可以在RegEx:上调用 split 方法"""\.\.""".r.split("a..b.c")。
回答by Fabian Steeg
That line of Ruby should work just like it is in Scala too and return an Array[String].
那行 Ruby 也应该像在 Scala 中一样工作，并返回一个Array[String].
回答by haffla
If you look at the Java implementationyou see that the parameter to String#splitwill be in fact compiled to a regular expression.
如果您查看Java 实现，您会发现 to 参数String#split实际上将被编译为正则表达式。
There is no problem with "string1::string2".split("::")because ":" is just a character in a regular expression, but for instance "string1|string2".split("|")will not yield the expected result. "|" is the special symbol for alternation in a regular expression.
没有问题，"string1::string2".split("::")因为“：”只是正则表达式中的一个字符，但例如"string1|string2".split("|")不会产生预期的结果。“|” 是正则表达式中交替的特殊符号。
scala> "string1|string2".split("|")
res0: Array[String] = Array(s, t, r, i, n, g, 1, |, s, t, r, i, n, g, 2)
