Nice graphical explanations! It would be nice to see positive/negative look ahead/behind support as they're pretty powerful. The `\K` flag to clear the capture

Nice graphical explanations! It would be nice to see positive/negative look ahead/behind support as they're pretty powerful. The `\K` flag to clear the capture buffer (e.g. Perl flavor) is also a very useful regexp feature absent here (e.g. when testing `grep` commands).