In bash I want to return file name (and the path to the file) for every file of type .php|.html|.js containing the case-insensitive string "document.cookie" | "setcookie"
How would I do that?
Answer
egrep -ir --include=*.{php,html,js} "(document.cookie|setcookie)" .
The r flag means to search recursively (search subdirectories). The i flag means case insensitive.
If you just want file names add the l (lowercase L) flag:
egrep -lir --include=*.{php,html,js} "(document.cookie|setcookie)" .