CODEWITHSUNDEEP
java
Ben Collins
Ben Collins

Reputation: 11

How to get a certain word out of a string

So i need a help to find certain word in the given string. So I've made a string and used a for loop to get the word i want, but it doesn't seem to be working, I only want to get the 2019 out of the string.

public void wStart() throws Exception {
    String folder = "file/print/system/2019/12 - December";
    String[] folderSplit = folder.split("/");
    for (int i=3; i < folderSplit.length; i++) {
        String folderResult = folderSplit[i];
        System.out.println(folderResult);
    }
}

Upvotes: 1

Views: 128

Answers (3)

Kamal Kumar
Kamal Kumar

Reputation: 194

You can try this method, which I just added a statement that compares loop values with the string: 

public static void wStart() throws Exception
{
 String folder = "file/print/system/2019/12 - December";
  String[] folderSplit = folder.split("/");
  for(int i = 3; i < folderSplit.length; i++)
   {
      if(folderSplit[i] == "2019"){
          String folderResult = folderSplit[i];
          System.out.println("Excepted "+folderResult);
      }else{
          String folderResult = folderSplit[i];
          System.out.println("Not Excepted "+folderResult);
      }

   }
}

Upvotes: -1

Emma
Emma

Reputation: 27723

If we only wish to get the year in a string with no other four digits number, we would be simply using this expression: 

(\d{4})

Demo 1

or we would add additional boundaries, such as: 

\/(\d{4})\/

Demo 2

Test

import java.util.regex.Matcher;
import java.util.regex.Pattern;

final String regex = "(\\d{4})";
final String string = "file/print/system/2019/12 - December";

final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);

while (matcher.find()) {
    System.out.println("Full match: " + matcher.group(0));
    for (int i = 1; i <= matcher.groupCount(); i++) {
        System.out.println("Group " + i + ": " + matcher.group(i));
    }
}

RegEx Circuit

jex.im visualizes regular expressions:

enter image description here

Upvotes: 5

Tim Biegeleisen
Tim Biegeleisen

Reputation: 520908

If the year would always be the second to last path element, then just access that element:

String folder = "file/print/system/2019/12 - December";
String[] parts = folder.split("/");
String year = parts[parts.length-2];

If instead the year could be any path element, then we can try fishing it out:

String year = folder.replaceAll(".*\\b(\\d{4})\\b.*", "$1");

Upvotes: 3

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