Maximum number of groups in Java Regex

StackOverflow https://stackoverflow.com/questions/1010120

  •  06-07-2019
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Question

I had assumed the maximum was 9 but after some experimentation I know it is not. The javadocs for Pattern and Matcher to not list a maximum.

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Solution

There's no explicit ceiling, so theoretically the max would be Integer.MAX_VALUE. Practically speaking, the max will vary according the resources available, but I'm sure it's a lot more than you'll ever need.

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