using or in windows findstr code example

Example 1: dos findstr

# EXAMPLE: display the files (within the given folder) that contain the text "+renew"
findstr /n /l "+renew" "C:\Users\LongW\*"

# SYNTAX
# findstr <options-if-any> "<string-to-find>" "<path(s)-to-search>"
  
# OPTIONS'  
# /b  Matches the text pattern if it is at the beginning of a line.
# /e  Matches the text pattern if it is at the end of a line.
# /l  Processes search strings literally.
# /r  Processes search strings as regular expressions. This is the default setting.
# /s  Searches the current directory and all subdirectories.
# /i  Ignores the case of the characters when searching for the string.
# /x  Prints lines that match exactly.
# /v  Prints only lines that don't contain a match.
# /n  Prints the line number of each line that matches.
# /m  Prints only the file name if a file contains a match.
# /o  Prints character offset before each matching line.
# /p  Skips files with non-printable characters.

# https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/findstr

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: