Regex fails to capture all groups

Question

Using java.util.regex (jdk 1.6), the regular expression 201210(\\d{5,5})Test applied to the subject string 20121000002Test only captures <

Answer 1

From java.util.regex.MatchResult.groupCount:

Group zero denotes the entire pattern by convention. It is not included in this count.

So iterate through groupCount() + 1.