Allows you to select files by mask, search in subdirectories.
Sorry for the spelling and phonetic errors in the text.
Owner and main writer of MintGuide.org is not a native English speaker.
Sagasu has a simple and intuitive interface. In fact, you need only to specify the directory and the search string. You can use Perl regular expressions to search for whole words, case sensitive characters, to set the depth of search directories, to exclude directories CSV and instruct them not to follow symbolic links.
The search results can be opened in different tabs and switch between them.
Installation into Linux Mints:
sudo apt-get install sagasu