How to Split a String into an Array of Individual Characters?

Splitting a String into an Array of Individual Characters

In programming, it is often necessary to manipulate strings and extract specific characters from them. This question delves into a technique for splitting a string into an array, where each element represents a single character.

Problem Statement:

Given a string like "cat," how can we split it into an array containing the individual characters, resulting in ["c", "a", "t"]?

Solution:

The solution utilizes the split method in conjunction with a regular expression to achieve the desired result. The expression (?!^) is used to specify a negative lookahead assertion that ensures the split does not happen at the start of the string.

For example, the following code demonstrates the solution:

String str = "cat";
String[] characters = str.split("(?!^)");

By applying the split method with the provided regular expression, we obtain an array of Strings: ["c", "a", "t"], where each element represents a character in the original string.

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