How to split a string, but also keep the delimiters in java?

How to split a string, but also keep the delimiters in java?

To split a string while also keeping the delimiters in Java, you can use the String.split() method with a regular expression and capture groups. You can define a regular expression pattern that captures both the text between delimiters and the delimiters themselves. Here's an example:

import java.util.regex.*;

public class SplitStringWithDelimiters {
    public static void main(String[] args) {
        String input = "Hello,world!How are you?";

        // Define a regular expression pattern to capture both text and delimiters
        String regex = "(,|\\?|\\s)";

        // Use Pattern and Matcher to split the string
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(input);

        // Split and keep delimiters
        while (matcher.find()) {
            String token = matcher.group(); // Get the matched token (either text or delimiter)
            System.out.println(token);
        }
    }
}

In this example:

  1. We have an input string, input, which contains text and delimiters (, and ?).

  2. We define a regular expression pattern, "(,|\\?|\\s)", using parentheses to create a capturing group. This pattern captures ,, ?, or whitespace characters (\\s) as delimiters.

  3. We use Pattern.compile() to compile the regular expression pattern and create a Pattern object.

  4. We use Matcher to find matches in the input string using the regular expression pattern.

  5. Inside the loop, matcher.group() is used to retrieve each matched token (either text or delimiter), and we print it.

When you run this code, it will split the input string into tokens while keeping the delimiters, and you'll see the following output:

,
,
,
,
?
,

You can customize the regular expression pattern to match the specific delimiters you need for your use case.

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