Finds the substring before a specific target.This function is valid in v2.10.0 to v2.16.0. This function has been downloaded 8 times.
targetthat you want to key off of within
subject. If negative, the occurrence will be counted from the end of
targetwas not found or the specified occurrence (
targetwas not found,
nullwill be returned.
This function requires the following function which is included automatically: