用正则表达式分割字符串

Question

How can I split string for 3 character? (I don't want to do loop for this, maybe some regular expression will be help)

I give example:

String str = "111222333444";
String[] result = str.split("help?"); // get "111", "222", "333"

Answer 1

Using guava-library

 Iterable<String> strNums = Splitter.fixedLength(3).split("111222333444")

Readable than using regex. You can then use Ints.tryParse(...) to get Integer version if you want.

Answer 2

Using .split will match regular expressions in the string which, in the underlying implementation, involves traversing the entire string anyway. Writing a simple loop to just create a token from every 3 characters would probably be more efficient.

Answer 3

坦白说，我认为您不能针对没有循环的未定义长度的字符串执行此操作。

Answer 4

You can not use split because the arg of split is the separator, not the resulting sub-strings. So, your separator regex would be nothing !?

Sorry, you heve write loop. BTW, the regex engine for split is full of loops.