Install visual-regexp by entering the following commands in the terminal:
sudo apt update sudo apt install visual-regexp
Description:
Interactively debug regular expressions
This Tcl script shows the result of running a regular expression, making debugging relatively easy. It also assists in the construction of regular expressions.
Homepage: http://laurent.riesterer.free.fr/regexp/
Version: 3.2-0ubuntu1
Section: universe/devel