The bundle provides two Perl scripts:
– lookbibtex, which searches a BibTeX database for a Perl regular expression, optionally with a restriction on which field to examine; and
– bibdestringify, which performs all string substitutions (i.e., things of the form @string{foo = "bar"}) in a BibTeX file.

The author is John Heidemann. The package is Copyright © 1990 John Heidemann.