CONTAINSSTRING, CONTAINSSTRINGEXACT – DAX Guide

CONTAINSSTRING: Returns TRUE if one text string contains another text string. CONTAINSSTRING is not case-sensitive, but it is accent-sensitive.
https://dax.guide/containsstring/

CONTAINSSTRINGEXACT: Returns TRUE if one text string contains another text string. CONTAINSSTRINGEXACT is case-sensitive and accent-sensitive.
https://dax.guide/containsstringexact/