使用正则表达式拆分数学方程式

Question

So I am trying to split a simple mathematical equation containing two doubles in scientific notation, eg "54E-1-57E-1". I'm trying to find regex pattern to do this for me, but I have come across two problems. The first is, the following code splits my string successfully but for some reason negTest prints out false, and I have no idea why.

public static void main(String[] args) {
    String testString = "54E-1-57E-1";
    boolean negTest = string.contains("(?<=\\d)-(?=\\d)");
    System.out.println(negTest);
    String[] output = testString.split("(?<=\\d)-(?=\\d)");
    System.out.println(Arrays.toString(output));
}

//Output:
//false
//[54E-1, 57E-1]

I assume it is a problem with my regex, but the string splits successfully around the minus which confuses me. The second problem is how would I split it so that the minus is included in the second term, eg

[54E-1, -57E-1]

Any help/explanations are greatly appreciated!

Answer 1

1> contains doesn't take regex as a parameter..So you are trying to match (?<=\\\\d)-(?=\\\\d) as a string not regex

2>To include - ,your regex should be

(?<=\\d)(?=-\\d)