How to use VIM's toupper whithin a replacement string?

Question

Hello, Is it possible to use toupper in replacement string? Suppose, there are member Declarations like this:

int myVar;

I want to make the first letter of variable name to a capital-letter:

int MyVar;

Unfortunately this doesn't work:

:1,$s/\(\w\+\)\s\+\(\w\)\(\w*\)\s*;/\1 \=toupper(submatch(\2))\3;/

Finally, I could use \u for doing this:

:1,$s/\(\w\+\)\s\+\(\w\)\(\w*\)\s*;/\1 \u\2\3;/

But I am still curious if using functions like toupper within the replacement string works?

Answer 1

Try:

:1,$s/\(\w\+\)\s\+\(\w\)\(\w*\)\s*;/\=submatch(1)." ".toupper(submatch(2)).submatch(3).";"/