split string into array and add the delimiter to the array

Question

i have an String and i need to split this String to array My String is for example "-2x+3"

i split it with this code

public static String[] splitAnswer(String answerInput){
        answerInput = answerInput.trim();
        String[] token = answerInput.split("[\\+\\-\\*\\\\\\/]");
        return token;
    }

but i need the minus sign with 2x i.e. (-2x) and my array output will be {"-2x","3"} the important thing i need the minus with the number after

my purpose to check the answer of student if it's right or not for example if the answer is -2x+3 and the student answer +3-2x the answer must be correct that what i search to — badr aldeen
– badr aldeen, Commented Apr 16, 2015 at 17:39

Rohit Jain · Accepted Answer · 2015-04-16 17:35:13Z

2

You can use following regex:

String[] token = answerInput.split("[+*/]|(?=-)")

So, this splits on all the operators, except -. For - operator, it splits on empty string before the - operator. BTW, you don't need to escape anything inside the character class.

For -2x + 3, the split positions are:

|-2x+3   ( `|` is empty space)
^   ^

answered Apr 16, 2015 at 17:35

Rohit Jain

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