in reply to Yapp

See also:
  1. Parse::Eyapp
  2. The tutorial "Parsing Strings and Trees with Parse::Eyapp (An Introduction to Compiler Construction in seven pages)" in http://nereida.deioc.ull.es/~pl/eyapsimple/
  3. The pdf file in http://nereida.deioc.ull.es/~pl/perlexamples/Eyapp.pdf
  4. "Análisis Léxico y Sintáctico", (Notes for a course in compiler construction) at http://nereida.deioc.ull.es/~pl/perlexamples/. However is in Spanish.

In Section Seekers of Perl Wisdom