bibtex-search-forward-field is a compiled Lisp function in `bibtex.el'.

(bibtex-search-forward-field NAME &optional BOUND)

Search forward to find a BibTeX field of name NAME.
If a syntactically correct field is found, return a pair containing
the boundaries of the name and text parts of the field. The search
is limited by optional arg BOUND. If BOUND is t the search is limited
by the end of the current entry. Do not move point.