The Conroy & Conroy Subroutine Library (2021.3 edition)

Pos
What: integer function
File:
Layer: 1
Format: result = Pos( substring, string )
Platforms: C++, C#, Javascript, Pascal, Python

This returns the position of substring within string. If not found, the result is one less than the lowest string index. In Pascal, this is only defined if the version of Pascal being used does not provide the function.