Egof
To retrieve obscure syntax of languages, or bookmark code comments.
.... When creating them Egof goes through all (or specified subset of) user's folders/files, finds instances of the search-tag, and stores those lines of code plus some surrounding code.
During running, Egof displays a prompt, and allows users to change options and modify the search, (using the same option-parsing software that was used to parse the command line.)
Egof is command-line based.
The documentation is comprehensive. Please invest <5 min to read the "Overview" section. Thank you.