Removing empty string from consecutive delimiter for String.split?

Question

I have a simple program to split a string by regex like so:

public class Main
{
    public static void main(String[] args) {
        String regex = "\\{|\\}|\\+";
        String input = "F-{0000}a{yy}{mm}";

        String [] splitInput = input.split(regex);


        for(int i = 0; i < splitInput.length; i++) {
            System.out.println("Value: " + splitInput[i]);
        }

    }
}

and it prints

Value: 0 A-                                                                                                                                                                                                                                       
Value: 1 0000                                                                                                                                                                                                                                     
Value: 2 a                                                                                                                                                                                                                                        
Value: 3 yy                                                                                                                                                                                                                                       
Value: 4                                                                                                                                                                                                                                          
Value: 5 mm

I just want it so that my split string does not include value 4 which is the empty character. I know this is happening because the }{ are back to back. My regex I believe just says to split on { or } and I thought the + will split on consecutive delmiters but that doesn't seem to be the case. Any ideas?

Nick · Accepted Answer · 2019-11-23 03:21:52Z

3

Your regex is incorrect, it will split on {, } or +. What you want is to split on one or more of { or } which you can do with a character class:

String regex = "[{}]+";

Demo on rextester

answered Nov 23, 2019 at 3:21

Nick

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