gtk-text-iter-forward-find-char (iter pred limit)

iter -- a gtk-text-iter instance
pred -- a gtk-text-char-predicate callback function to be called on each character
limit -- a gtk-text-iter instance with the search limit, or nil for none

A boolean whether a match was found.

Advances the iterator, calling the function pred on each character. If the function pred returns true, returns true and stops scanning. If the function pred never returns true, the iterator is set to limit if limit is non-nil, otherwise to the end iterator.