Substring between ' ' symbols

Question

<img src='http://res.cloudinary.com/test/image/upload/v1/testFolder/1024x1024.jpg'/>

I want to get the url which is between ' and '. This is what I tried and it gives String index out of range : -1 error.

String html = "<img src='http://res.cloudinary.com/test/image/upload/v1/testFolder/1024x1024.jpg'/>";

html.substring((html.indexOf("'")), html.indexOf("'"));

and also I tried html.substring((html.indexOf("'")) +1 , html.indexOf("'"));

How can I get the url between ' and '?

Why would `indexOf` for a given character ever give you different results? — Dave Newton, Mar 13 '17 at 17:26
Well, you've already gotten an answer, but the Javadocs are (generally) your friend. — Dave Newton, Mar 13 '17 at 17:28
Please remember this: http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags — BCartolo, Mar 13 '17 at 17:41

ControlAltDel · Answer 1 · 2017-03-13T18:15:56.170

3

You need to retain the first index so that you can search for the next one beyond that point

int idx = html.indexOf("'") + 1;
int idx2 = html.indexOf("'", idx); // this will find the next ' character

System.out.println(html.substring(idx, idx2));

edited Mar 13 '17 at 18:15

answered Mar 13 '17 at 17:29

ControlAltDel

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Thank you for detailed answer. What exactly is the point of writing `+ 1`? – happyman Mar 13 '17 at 17:31
You should try it yourself and see what happens! But the answer is that if you don't have the + 1 it will find the same ' character again – ControlAltDel Mar 13 '17 at 17:32
This doesn't answer the OP's observation that he got an out-of-bounds exception: -1. – Klitos Kyriacou Mar 13 '17 at 17:47
Shouldn't it be `System.out.println(html.substring(idx + 1, idx2));` or even better add the `+ 1` in the first line? – Samuel Kirschner Mar 13 '17 at 18:01

Roma Khomyshyn · Answer 2 · 2017-03-13T17:32:39.003

1

You have to change html.indexOf("'") to html.lastIndexOf("'").

try it:

public static void main(String[] args) throws ClassNotFoundException {
    String html = "<img src='http://res.cloudinary.com/test/image/upload/v1/testFolder/1024x1024.jpg'/>";

    System.out.println(html.substring(html.indexOf("'") + 1, html.lastIndexOf("'")));
}

edited Mar 13 '17 at 17:32

answered Mar 13 '17 at 17:27

Roma Khomyshyn

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Thank you for the answer. We need to use `lastIndexOf` for finding the second one as I understand from your answer. – happyman Mar 13 '17 at 17:32
Yes, you will get string between the first **'** and the last one **'** – Roma Khomyshyn Mar 13 '17 at 17:34

score 0 · Answer 3 · answered Mar 13 '17 at 17:36

0

You could also use a regex pattern....

Pattern p = Pattern.compile("'(.*?)'");
Matcher m = p.matcher(html);
m.find();
m.group(1); // will return http://res.cloudinary.com/test/image/upload/v1/testFolder/1024x1024.jpg

answered Mar 13 '17 at 17:36

Ben Arnao

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Substring between ' ' symbols

3 Answers3