Series.str.
rindex
Return highest indexes in each strings where the substring is fully contained between [start:end]. This is the same as str.rfind except instead of returning -1, it raises a ValueError when the substring is not found. Equivalent to standard str.rindex.
str.rfind
str.rindex
Substring being searched.
Left edge index.
Right edge index.
See also
index
Return lowest indexes in each strings.