isearch-yank-internal

isearch-yank-internal is a compiled Lisp function in `isearch.el'.

(isearch-yank-internal JUMPFORM)

Pull the text from point to the point reached by JUMPFORM.
JUMPFORM is a lambda expression that takes no arguments and returns
a buffer position, possibly having moved point to that position.
For example, it might move point forward by a word and return point,
or it might return the position of the end of the line.