dna2abc turns DNA sequences into musical sequences. The key feature is the rule editor; a rule is a regularexpression paired with a Tcl script. dna2abc scans a DNA sequence, testing each regularexpression: if it matches, the Tcl script is run.
Perl Entrez Gene Parser project provides Perl parsers for NCBI's Entrez Gene based on regularexpression, Parse::RecDescent, Parse::Yapp and Perl-byacc. Some can parse human genome annotations in minutes. Documentation and user guides are provided.