Why pcregrep version 7.8 doesn't support regular expression match groups?

Issue

• The pcre package that ships with RHEL6 is old.

  $ pcregrep --version
  pcregrep version 7.8 2008-09-05

• It doesn't support regular expression match groups. Which newer version of the package will support for match groups?

• The current version on RHEL6 does not have the "-onumber" option.

• Requirement is to be able to print match groups to pipe it into another command.