Steps to reproduce:

Apply a template such as "Cisco IOS SNMP" to host.
Configure a user macros with context such as in screenshot

{$IFCONTROL:regex:"^(Gi[1-2]\/0\/(1[3-9]|2[0-9]|3[0-6]))$"} => 0

Similar to ZBX-18209

Result:

Each time a trigger where regex is False (ie interface name Gi1/0/12) the error shown in screenshot is triggered in "Problems" and "Dashboard".

No issue if regex is True (trigger is ignored as expected).

Expected:

No error, triggers normally.