Windows Find a string in a file with long lines code example

Example 1: findstr current folder

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

Example 2: find string in file windows

findstr /spin /c:"string" [files]
The parameters have the following meanings:

s = recursive
p = skip non-printable characters
i = case insensitive
n = print line numbers
And the string to search for is the bit you put in quotes after /c: