How to split the string using Pattern/Matcher with multiple occurrences of pattern?

Question

I have a string where the pattern has multiple occurrences. I want to split the string into 4 parts with pattern "multiplex" including the pattern(multiplex). I want to have 4 strings

String1 = Name to true

String2 = Multiplex to 1000

String3 = Multiplex to 200

String4 = Multiplex to true

String aaa = "Name:1/1, Network: true, ...(more data)... MPEG: true Multiplex: 0004, Transport Stream ID: 0, Bandwidth: 5000000,...(more data)... Reserved Bandwidth: 1000 Multiplex: 0002, Transport Stream ID: 0, Bandwidth: 5000000,...(more data).. Reserved Bandwidth: 200 Multiplex: 0008, Transport Stream ID: 0, Bandwidth: 5000000, Reserved Bandwidth: 100000,...(more data)...true

    Pattern pattern = Pattern.compile("Multiplex:"); 

    Matcher m = pattern.matcher(aaa); 

    while (m.find())

Ho do I divide the string into 4 parts including "Multiplex"?

Why can't you just `split` on Multiplex: using lookahead/lookbehind to retain the word? — GBlodgett, Nov 02 '18 at 17:56
https://stackoverflow.com/questions/2206378/how-to-split-a-string-but-also-keep-the-delimiters — GBlodgett, Nov 02 '18 at 18:00

score 1 · Accepted Answer · answered Nov 02 '18 at 18:04

1

You can use a regex pattern with a positive lookahead,

public class MyClass {
    public static void main(String args[]) {
        String s = "Name:1/1, Network: true, ...(more data)... MPEG: true Multiplex: 0004, Transport Stream ID: 0, Bandwidth: 5000000,...(more data)... Reserved Bandwidth: 1000 Multiplex: 0002, Transport Stream ID: 0, Bandwidth: 5000000,...(more data).. Reserved Bandwidth: 200 Multiplex: 0008, Transport Stream ID: 0, Bandwidth: 5000000, Reserved Bandwidth: 100000,...(more data)...true";
        String[] arr = s.split("(?=Multiplex:)");

        for(String str : arr){
            System.out.println(str);
        }
    }
}

This regex (?=Multiplex:) matches an empty string which is followed by Multiplex:

answered Nov 02 '18 at 18:04

mettleap

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It is already saved in the array named arr which is an array of String – mettleap Nov 02 '18 at 18:10
Here arr[0] has name to true. How do I separate the values by "," in each array as I will be using this stream into a hashmap – c.r Nov 02 '18 at 18:43
@c.r, in that case just use the split method again on individual array elements ... for eg. if you do `arr[0].split(",")` you will get a new array and the split this time will be around commas in your arr[0] string – mettleap Nov 02 '18 at 18:46

How to split the string using Pattern/Matcher with multiple occurrences of pattern?

1 Answers1