FINDSTR /i /v code example

Example 1: findstr current folder

Just specify all posible files names in current directory with regex *:
findstr string_to_search *

Example 2: findstr case insensitive

Find strings with case-insensitive search using -i flag as follows:
findstr -i "Case_insensitive_substring"
For example:
dir | findstr -i "Case_insensitive_file_name"