Using Split in Java and substring the result

Question

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string split in java

I have this Key - Value , and I want to separate them from each other and get return like below:

String a = "Key"
String b = "Value"

so whats the easiest way to do it ?

I am a php developer so its kinda different , but now I know my mistake , it was using single quotation in the split method — Peril, Sep 26 '11 at 13:54
@Salah Yahya: Next time, try to also mention what you already tried inside the question, that way it has more value for future visitors. I even encourage you rewriting this question so it indicates a bit more effort. — Steven Jeuris, Sep 26 '11 at 13:58

NPE · Accepted Answer · 2011-09-26T13:54:56.447

12

String[] tok = "Key - Value".split(" - ", 2);
// TODO: check that tok.length==2 (if it isn't, the input string was malformed)
String a = tok[0];
String b = tok[1];

The " - " is a regular expression; it can be tweaked if you need to be more flexible about what constitutes a valid separator (e.g. to make the spaces optional, or to allow multiple consecutive spaces).

edited Sep 26 '11 at 13:54

answered Sep 26 '11 at 13:48

NPE

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score 6 · Answer 2 · answered Sep 26 '11 at 13:49

6

String[] parts = str.split("\\s*-\\s*");
String a = parts[0];
String b = parts[1];

answered Sep 26 '11 at 13:49

AlexR

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+1 I prefer the more flexible regex over `" - "` – Thomas Sep 26 '11 at 13:52

Aurelien Ribon · Answer 3 · 2015-02-10T21:14:40.553

3

int idx = str.indexOf(" - ");
String a = str.substring(0, idx);
String b = str.substring(idx+3, str.length());

split() is a bit more computation intensive than indexOf(), but if you don't need to split billions of times per seconds, you don't care.

edited Feb 10 '15 at 21:14

answered Sep 26 '11 at 13:50

Aurelien Ribon

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score 2 · Answer 4 · answered Sep 26 '11 at 13:53

2

String s = "Key - Value";
String[] arr = s.split("-");
String a = arr[0].trim();
String b = arr[1].trim();

answered Sep 26 '11 at 13:53

Eng.Fouad

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score 2 · Answer 5 · answered Sep 26 '11 at 13:55

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I like using StringUtils.substringBefore and StringUtils.substringAfter from the belowed Jakarta Commons Lang library.

answered Sep 26 '11 at 13:55

Ravi Wallau

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score 1 · Answer 6 · edited Sep 26 '11 at 13:55

1

something like

String[] parts = "Key - Value".split(" - ");
String a = parts[0];
String b = parts[1];

edited Sep 26 '11 at 13:55

Eng.Fouad

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answered Sep 26 '11 at 13:49

MarcoS

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score 1 · Answer 7 · answered Sep 26 '11 at 13:53

As a little bit longer alternative:

    String text = "Key - Value";
    Pattern pairRegex = Pattern.compile("(.*) - (.*)");
    Matcher matcher = pairRegex.matcher(text);
    if (matcher.matches()) {
        String a = matcher.group(1);
        String b = matcher.group(2);
    }

Using Split in Java and substring the result

7 Answers7