OLD (will be deleted):
This adds a table which explains some metacharacters.
The short description is placed In the first column, then the
metacharacter and then additional hints.
It is intended for users who know that certain things (like word
boundary or non-whitespace) exist but cannot quite remember the exact
See also https://en.wikipedia.org/wiki/Regular_expression
Makes the actions to insert special characters which are currently only available via context menu to side buttons in the search and replace comboboxes. The context menu will still be available.
Screenshot with regular expressions off:
Screenshot with regular expressions on: