How to Split Strings at Regular Intervals in Java?

Splitting Strings at Intervals in Java

Splitting a string at specific intervals can be a common task in programming. In Java, achieving this using regular expressions offers a versatile and efficient solution.

Problem Statement

Consider the task of splitting a string at every 3rd character. In JavaScript, this can be accomplished using the following expression:

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

This expression successfully splits the string "foobarspam" into ["foo", "bar", "spa", "m"].

Java Implementation

To achieve the same result in Java, we can employ a similar approach using the Pattern and Matcher classes:

String input = "1234567890";
String[] arr = input.split("(?<=\G...)");

Explanation

The regular expression used here is:

(?<=\G...)

• (?<=\G) ensures that the match begins at the start of the string or any subsequent match.
• ... matches any three characters.

The (?<= ) construct essentially asserts that the preceding pattern (in this case, three characters) occurs before the match. By using the split method, we obtain an array of strings where each element represents a 3-character substring.

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