PositionTo()

Search for the last occurrence of a substring within a string, ending the search at a designated position.

location = PositionTo(int end_pos, string big_string, string search_string)

Argument	Contents
end_pos	The ending character position
big_string	The string to be searched
search_string	The string for which to search

An integer indicating the position at which search_string starts in big_string, or zero if search_string is not found in big_string.

If end_pos is null or less than one, the search ends at the end of the string.
The search moves from end_pos to the beginning of the string.
As long as the start of search_string is before end_pos its position can still be found; see the third example.

Function	Summary
Left()	Returns the leftmost n characters of a string
Position()	Returns the position of a substring within a string
PositionFrom()	Search for the first occurrence of a substring within a string, starting the search at a designated position
Right()	Returns the rightmost n characters of a string
Substitute()	Replaces a matching substring with a new string.
SubstituteChars()	Returns the input string with all occurrences of the characters listed in the find string replaced with the characters in the replacement string
Substring()	Extracts a portion of a string