Template-like string escapes in a major mode

[Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com>]

Hello. I have a major mode that I've been slowly developing on and off.

One thing that's left to implement for me is template engine-like string 
escapes. For example lets say we have a string "My name is [name]", 
where name should be treated as if it was outside of the string. Note 
that [] brackets can also appear normally like any C-inspired language, 
so they're only special within the "" quotes.

The way I understood is that I can't just rely on the syntax classes 
here and I have to write my own syntax-propertize-function. But this 
also seems like a very typical problem that's been solved in many 
existing major modes, so I somewhat expect someone to have the exact 
syntax-propertize-function I'm looking for already developed and tested. 
Any other pointers would be welcome too.