How to make a regular expression match based on a condition?

Question

I\'m trying to make a conditional regex, I know that there are other posts on stack overflow but there too specific to the problem.

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The Question

How can

Answer 1

I would like to use split which accept regex like so :

String[] split = nums.split("\\s+"); // ["42", "36", "23827"]

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If you want to use Pattern with Matcher, then you can use String \b\d+\b with word boundaries.

String regex = "\\b\\d+\\b";

By using word boundaries, you will avoid cases where the number is part of the word, for example "123 a4 5678 9b" you will get just ["123", "4578"]