REGEXP note
Rui Ying
Basic syntax
| Character | Description |
|---|---|
| ^ | start |
| $ | end |
| . | any one character |
| * | >1 character |
| [] | include |
| [^] | not include (e.g. [^A-C] is any one except for ABC) |
| \w | word = [A-Za-z0-9] |
| \W | inverse of \w |
A useful command
grep -rnw '/path/to/somewhere/' -e 'pattern'
- -r recursive
- -n line number
- -w word regexp
Shortcut
If you use Emacs, you can forget the command and use projectile. This is a project managing package which provides strong search ability with ag/rg (you can still choose grep though).
Update
In Linux, fuzzy finding fzf is another interesting program.