Great RegEx Tool with room for imporvements

Highlighting of the matches is great, multiline support works very good.
But some improvments could improve the workflow very much:

1) Provide a RegEx documentation and a Quickreferens for that
2) Provide a „Copy to Clippboard“ Button with all selectable languages
3) Provide Shortcuts for „Copy to Clippboard“ with the favorite(s) languages (like cmd+1 or something)
4) auto expansion of $-variables in the matched list

Ma1t3 about RegExRX, v1.8.1