FIND

Returns the position of a string of text within another string.You can also define where to begin the search. The search term can be a number or any string of characters. The search is case-sensitive.

FIND("FindText"; "Text" [; Position])

FindText refers to the text to be found.

Text is the text where the search takes place.

Position (optional) is the position in the text from which the search starts.

=FIND(76;998877665544) returns 6.