In PHP GUI, file
include/defines.inc.php
has a wrong regular expression for
ZBX_PREG_KEY_NAME
(line 649)
It is
([0-9a-zA-Z_,.-:_ ]+)
while it should be
([0-9a-zA-Z_,.\-:_ ]+)
so to allow "-" in key names
("-" has to be escaped if not last char insied [...])