Zabbix

..F....... [ZBX-25420] fixed regsub/iregsub returning output if there is no matc

* commit 'bd791fe7225aad314a3a60521928c0425f12253b':
  .......... [ZBX-25420] uncommented and fixed regsub and iregsub cases
  ..F....... [ZBX-25420] fixed runtime error
  ..F....... [ZBX-25420] fixed cached test values
  ..F....... [ZBX-25420] added test case
  ..F....... [ZBX-25420] fixed regsub/iregsub returning output if there is no matchgp
  ..F....... [ZBX-25420] fixed macro name in input element breaking structured data
  .D........ [ZBX-25420] added changelog entry