How to Split a String into an Array of Characters Using Regular Expressions?

Splitting Strings into Character Arrays

To split a string into an array of individual character strings, one effective solution is to employ the split method in conjunction with a regular expression.

The following code demonstrates how to achieve this:

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

The regular expression "(?!^)" is essential for this process. It ensures that the string is split into individual characters while avoiding an empty string as the first element. Specifically, (?!^) means "not followed by the start of the string," excluding the empty string that would result from splitting at the beginning of the string.

Executing the code above with the input string "cat" yields the desired output:

characters = ["c", "a", "t"]

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