在java中使用正则表达式拆分字符串 [英] Split String using regex in java

问题描述

我是regex的新手，我正在尝试做的是在某些条件下拆分String，但我不知道该怎么做。

I'm new to regex, What i'm trying to do is to split the String with certain conditions but i don't know how to do it.

以下是样本/条件

String str = sum1=x+(5+a)

Array[0] = sum1
Array[1] = =
Array[2] = x
Array[3] = +
Array[4] = (
Array[5] = 5
Array[6] = +
Array[7] = a
Array[8] = )

我希望将字符串拆分为 + ， - ， * ， \ ，（，）， =

这可能吗？

I want the string to be split by +,-,*,\,(,),=
Is this possible?

推荐答案

如果你真的需要使用正则表达式，你应该使用浏览机制，因为您不想将分割为这个字符，但 之前或之后的。

If you really need to use regex you should probably use look-around mechanism since you don't want to split at this characters, but before or after them.

String str = "sum1=x+(5+a)";
String[] array=str.replaceAll("\\s+","")//remove all spaces
                  .split("(?<=[+\\-*\\\\()=/])|(?=[+\\-*\\\\()=/])");
for (int i=0; i<array.length; i++)
    System.out.println("Array["+i+"] = "+array[i]);

输出：

Array[0] = sum1
Array[1] = =
Array[2] = x
Array[3] = +
Array[4] = (
Array[5] = 5
Array[6] = +
Array[7] = a
Array[8] = )

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