 PGE is a combination of runtime and compiler for Raku style grammars that allows any parrot-based compiler to use these tools for parsing, and also to provide rules to their runtimes.Among other Raku features, support for named captures was added to Perl 5.10 in 2007.In May 2012, the reference implementation of Raku, Rakudo, shipped its Rakudo Star monthly snapshot with a working JSON parser built entirely in Raku rules.