bibtex-text-in-string
bibtex-text-in-string is a compiled Lisp function in `bibtex.el
'.
(bibtex-text-in-string BOUNDS &optional CONTENT)
Get text in BibTeX string field defined via BOUNDS.
If optional arg CONTENT is non-nil extract content
by removing field delimiters and concatenating the resulting string.
If `bibtex-expand-strings' is non-nil, also expand BibTeX strings.