syl20bnr/spacemacs — pull request #180 by nmerinos (2014-11-30 02:00:39+00:00)
Title: Adding pcre2el

So this contrib layer sets up pcre2el or rxt (RegeXp Translator or RegeXp Tools) which is a utility for working with regular expressions in Emacs, to parse, convert, and font-lock PCRE, Emacs and rx regexps.