How to Split a String into Chunks at Regular Intervals in Java?

Dividing a String into Chunks at Specified Intervals using Java

In Java, splitting a string at regular intervals can be achieved using regular expressions.

For instance, the provided problem demonstrates how to divide a string "foobarspam" into chunks of three characters in JavaScript:

"foobarspam".match(/.{1,3}/g)

Java Implementation:

To replicate this functionality in Java, one can employ the following approach:

String s = "1234567890";
System.out.println(java.util.Arrays.toString(s.split("(?<=\G...)")));

Explanation of the Regex:

The regular expression used in this solution is:

(?<=\G...)

This regex consists of the following components:

• (?<=G): Matches an empty string at the end of the previous match.
• ...: Matches any three characters.
• (?<= ): Ensures that the pattern matches only if it is preceded by the three characters.

Therefore, this regex matches an empty string that has the last match followed by three characters before it. This allows for the desired splitting of the string.

Output:

When the above Java code is executed using the sample string "1234567890", it produces the following output:

[123, 456, 789, 0]

This demonstrates that the string has been successfully divided into chunks of three characters each.

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