如何在Java中保留分隔符的同时在不同的分隔符之间拆分文本？

Question

Is it possible to split text with different delimiters while keeping delimiters in place in returned array.

In example if I have a text that consist of : sin({$=i$}^2

and I want to split it in an array that looks like this :

['sin(' , '{$=i$}', '^2']

while my delimiters are { and } . What I managed to achieve is an array that looks like this : ['sin(' , '{$=i$', '}^2']

but I can't make that last one delimiter } in right place with this piece of code :

String text = "sin({$=i$}^2";
String[] splitted = text.split("(?=[{}])");

Answer 1

Based on your example it looks like you may be looking for

split("(?<=\\})|(?=\\{)")

We are using look-around mechanisms to

• (?<=\\\\}) split at place which has } before it (which means split after } )
• (?=\\\\{) split at place which has { after it (which means split before { )

But to be honest split or even regex may not be tool you are looking for. Try to think of building your own parser/state machine instead.