Maximum number of groups in Java Regex

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.

There are regex flavors that limit you to nine groups; Jakarta Regexp is one of them — Alan Moore
– Alan Moore, Commented Jun 18, 2009 at 1:06

Alan Moore · Accepted Answer · 2009-06-18 01:02:04Z

5

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.

answered Jun 18, 2009 at 1:02

Alan Moore

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