How to Use String.split() with Multiple Delimiters in Java?

Using String.split() with Multiple Delimiters

In various programming contexts, it becomes necessary to split a string based on specific delimiters to extract its constituent parts. However, when encountering multiple delimiters, we may face challenges in achieving the desired output.

Consider the following scenario: you are required to split a string using both dashes (-) and dots (.), as seen in the sample input "AA.BB-CC-DD.zip." The goal is to obtain the following result:

AA
BB
CC
DD
zip

However, a common misconception in attempting to split the string could be this code snippet:

private void getId(String pdfName) {
    String[] tokens = pdfName.split("-\.");
}

This code is designed to match a pattern where a dash is followed by a dot, which is not what we are trying to achieve. We need to use the regex OR operator to specify that either a dash or a dot should be used as a delimiter.

String[] tokens = pdfName.split("-|\.");

By incorporating the OR operator in the regex, we instruct the split() method to consider both dashes and dots as individual delimiters. This allows for a successful split of the string, yielding the desired output:

AA
BB
CC
DD
zip

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