provide an easy way to highlight regular expressions in editors
without duplicating possibly tricky code.
("character_added" hook): also called when a character has been removed
(it seems that a script using this hook is interesting in both kind
of changes anyway, and for backward compatibility with we want to keep
this hook anyway -- the character added is considered to be control-h (8)
in such a case)
remove obsolete examples as a result
git-svn-id: svn+ssh://svn.eu/Dev/trunk/gps@131361 936e1b1b-40f2-da11-902a-00137254ae57
