If you ever wanted to search for a particular text in certain types of files in Linux, you can use the following combo of find and grep
find / -name \*.xml -type f | xargs grep -i “text_to_search”
I used *.xml (note the \ before *) as the mask in the filename to look for all XML files.. then I piped this to grep using xargs.
A colleague pointed out that I can do the same by using
grep -r o-i “text_to_speech”