How can I split a string into alternating groups of letters and digits in Java?

Separating Digits and Letters in a String

Question:

How can we split a string into alternating groups of letters and digits in Java, considering that the length of each group may vary?

Solution:

To achieve this in Java, you can utilize the split() method with a regular expression that defines the separation pattern. The appropriate pattern is (?<=D)(?=d)|(?<=d)(?=D), which operates as follows:

• (?<=D)(?=d) identifies positions between a non-digit (D) and a digit (d).
• (?<=d)(?=D) identifies positions between a digit and a non-digit.

By matching these positions, the regular expression effectively splits the string at the designated intervals. Here's an example code:

<code class="java">String a = "123abc345def";
String[] x = a.split("(?<=\D)(?=\d)|(?<=\d)(?=\D)");</code>

This will produce the following result:

x[0] = "123"
x[1] = "abc"
x[2] = "345"
x[3] = "def"

Note that the number of groups (letters and digits) may vary, accommodating inputs like "1234a5bcdef."

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