org-babel-result-regexp

org-babel-result-regexp is a variable defined in `ob-core.el'.
Its value is

"^[ 	]*#\\+\\(name\\|results\\|tblname\\)\\(\\[\\(<\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} ?[^
\n>]*?\\)> \\)?\\([[:alnum:]]+\\)\\]\\)?\\:[ 	]*"

Documentation:
Regular expression used to match result lines.
If the results are associated with a hash key then the hash will
be saved in the second match data.