bibtex-any-entry-maybe-empty-head

bibtex-any-entry-maybe-empty-head is a variable defined in `bibtex.el'.
Its value is

"^[ 	]*\\(@[ 	]*[^\"#%'(),={} 	\n0-9][^\"#%'(),={} 	\n]*\\)[ 	]*[({][ 	\n]*\\([][[:alnum:].:;?!`'/*@+|()<>&_^$-]+\\)?"

• This variable may be risky if used as a file-local variable.

Documentation:
Regexp matching the header line of any BibTeX entry (possibly without key).