How to Split a String into a Character Array Using Regex?

Splitting Strings into Character Array

In programming, it may be necessary to divide a string into an array of individual characters. Consider the need to split the string "cat" into an array of three character strings: "c", "a", and "t".

To achieve this, you can employ the split() method, which divides a string based on a specified delimiter. However, to split a string into individual characters, you must use a technique to trick the split() method into recognizing the absence of any explicit delimiter.

In this case, the following code can be used:

"cat".split("(?!^)")

The provided regex expression (?!^) is known as a negative lookahead assertion. It essentially checks if the current position is not the start of the string and subsequently splits the string into individual characters.

By leveraging this regex expression, the code successfully splits the string "cat" into the desired array:

["c", "a", "t"]

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