bibtex-parse-string is a compiled Lisp function in `bibtex.el'.

(bibtex-parse-string &optional EMPTY-KEY)

Parse a BibTeX string entry beginning at the position of point.
If a syntactically correct entry is found, return a cons pair containing
the boundaries of the reference key and text parts of the entry.
If EMPTY-KEY is non-nil, key may be empty. Do not move point.