正则表达式用定界符拆分，同时保留定界符

Question

我正在尝试将带有分隔符的字符串拆分为数组，同时保留分隔符。

我得到的字符串是：“2+37/4+26”。

我希望数组为：[2,+,37,/,4,+,26]

Answer 1

您可以使用 lookarounds 拆分：

String[] tok = input.split("(?<=[+*/-])|(?=[+*/-])");

RegEx Demo

解释：

(?<=[+*/-])  # when preceding character is one of 4 arithmetic operators
|            # regex alternation
(?=[+*/-])   # when following character is one of 4 arithmetic operators

正则表达式用定界符拆分，同时保留定界符

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