find needle in haystack and traverse all subdirectories
findstr /S /i needle hay*.stack
find a specific phrase
``findstr /c:blah blah blah hay*.stack```
use regex
findstr /r /c:^needle hay*.stack
find needle in haystack and traverse all subdirectories
findstr /S /i needle hay*.stack
find a specific phrase
``findstr /c:blah blah blah hay*.stack```
use regex
findstr /r /c:^needle hay*.stack