Get Substring from a String in Java

Question

I have the following text:

...,Niedersachsen,NOT IN CHARGE SINCE: 03.2009, CATEGORY:...,

Now I want to extract the date after NOT IN CHARGE SINCE: until the comma. So i need only 03.2009 as result in my substring.

So how can I handle that?

String substr = "not in charge since:";
String before = s.substring(0, s.indexOf(substr));
String after = s.substring(s.indexOf(substr),s.lastIndexOf(","));

EDIT

for (String s : split) {
    s = s.toLowerCase();
    if (s.contains("ex peps")) {
        String substr = "not in charge since:";
        String before = s.substring(0, s.indexOf(substr));
        String after = s.substring(s.indexOf(substr), s.lastIndexOf(","));

        System.out.println(before);
        System.out.println(after);
        System.out.println("PEP!!!");
    } else {
        System.out.println("Line ok");
    }
}

But that is not the result I want.

String.substring is case-sensitive, so in your example, substr won't be found in s. (stackoverflow.com/questions/1126227/indexof-case-sensitive) — Sentry
– Sentry, Commented May 17, 2017 at 12:14
@Captai-N you should probably consider a regex. It would be much more efficient, and readable. — dumbPotato21
– dumbPotato21, Commented May 17, 2017 at 12:17
Your issue is using lastIndexOf(","). If the string after SINCE contains more than one ,, it won't work. You should get the first index of , in the substring after SINCE — Jeremy Grand
– Jeremy Grand, Commented May 17, 2017 at 12:18
@Shashwat Well. If there are no other colons in that string, then a simple indexOf(':') will beat any regex regarding performance. — GhostCat
– GhostCat, Commented May 17, 2017 at 12:21

Youcef LAIDANI · Accepted Answer · 2017-05-17 12:29:31Z

8

You can use Patterns for example :

String str = "Niedersachsen,NOT IN CHARGE SINCE: 03.2009, CATEGORY";
Pattern p = Pattern.compile("\\d{2}\\.\\d{4}");
Matcher m = p.matcher(str);

if (m.find()) {
    System.out.println(m.group());
}

Output

03.2009

Note : if you want to get similar dates in all your String you can use while instead of if.

Edit

Or you can use :

String str = "Niedersachsen,NOT IN CHARGE SINCE: 03.03.2009, CATEGORY";
Pattern p = Pattern.compile("SINCE:(.*?)\\,");
Matcher m = p.matcher(str);

if (m.find()) {
    System.out.println(m.group(1).trim());
}

edited May 17, 2017 at 12:29

answered May 17, 2017 at 12:19

Youcef LAIDANI

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1 Comment

Captai-N Over a year ago

Thanks for the suggestion it works as far. But the date can also be a full date format for example 01.03.20009

Sky · Accepted Answer · 2017-05-17 12:25:02Z

4

You can use : to separate the String s.

String substr = "NOT IN CHARGE SINCE:";
String before = s.substring(0, s.indexOf(substr)+1);
String after = s.substring(s.indexOf(':')+1, s.lastIndexOf(','));

edited May 17, 2017 at 12:25

answered May 17, 2017 at 12:17

Sky

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Comments

GhostCat · Accepted Answer · 2017-05-17 12:26:35Z

4

Of course, regular expressions give you more ways to do searching/matching, but assuming that the ":" is the key thing you are looking for (and it shows up exactly once in that position) then:

s.substring(s.indexOf(':')+1, s.lastIndexOf(',')).trim();

is the "most simple" and "least overhead" way of fetching that substring.

Hint: as you are searching for a single character, use a character as search pattern; not a string!

edited May 17, 2017 at 12:26

answered May 17, 2017 at 12:20

GhostCat

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1 Comment

GhostCat Over a year ago

Makes sense ... but his question isnt really clear. Does he want the number, or a string with the trailing space ;-)

Matthias · Accepted Answer · 2017-05-17 12:18:37Z

1

If you have a more generic usecase and you know the structure of the text to be matched well you might profit from using regular expressions:

Pattern pattern = Pattern.compile(".*NOT IN CHARGE SINCE: \([0-9.]*\),");
Matcher matcher = pattern.matcher(line);
System.out.println(matcher.group());

answered May 17, 2017 at 12:18

Matthias

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Comments

Denis Ismailovski · Accepted Answer · 2017-05-17 12:22:44Z

0

A more generic way to solve your problem is to use Regex to match Every group Between : and ,

Pattern pattern = Pattern.compile("(?<=:)(.*?)(?=,)");
Matcher m = p.matcher(str);

answered May 17, 2017 at 12:22

Denis Ismailovski

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Comments

Chiranjib · Accepted Answer · 2017-05-17 12:29:32Z

0

You have to create a pattern for it. Try this as a simple regex starting point, and feel free to improvise on it:

String s = "...,Niedersachsen,NOT IN CHARGE SINCE: 03.2009, CATEGORY:....,";
Pattern pattern = Pattern.compile(".*NOT IN CHARGE SINCE: ([\\d\\.]*).*");
Matcher matcher = pattern.matcher(s);

if (matcher.find())
{
    System.out.println(matcher.group(1));
}

That should get you whatever group of digits you received as date.

edited May 17, 2017 at 12:29

answered May 17, 2017 at 12:22

Chiranjib

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