Frontend Support of regsub() for LLD macros

Frontend does not allow LLD function macros in trigger expression

Expression in trigger prototype:

{LLD function macro:key["{{#VALUE}.regsub(\"^([0-9]+)\", Server ID: \1)}"].last()}={{#VALUE}.regsub("^([0-9]+)", Server ID: \1)}

Manual update:

update triggers set expression='{17682}={{#VALUE}.regsub("^([0-9]+)", Server ID: \\1)}' where description='{#VALUE}';

Additional places where frontend does not allow LLD function macros
for item prototypes in:

• update intervals;
• history storage periods;
• trend storage periods;
• item value preprocessing steps;
• HTTP agent required status codes field;
• HTTP agent HTTP timeout field;

All places where LLD macro is supported must allow function macros.