Question : Search Files within Subdirectories for String Recursively

I have the following directory:

/opt/apps/mydir

Under "mydir" I have multiple subdirectories.  I would like to search each of the files within those subdirectories for the string "mystring".  What's the best way to accomplish this?

Answer : Search Files within Subdirectories for String Recursively

try:

find /opt/apps/mydir -type f | xargs grep  "mystring" > search_results.log