Way to call the Function/SP question

Hi there

I'm working on Pervasive -> MS SQL migration project.

The Pervasive code has tons of "Call" operators. I found that the only way to call the function/SP is the Exec (Execute) so "Call" must be replaced absolutely everywhere. Is that correct?

I can see that MS SQL deviates from the rule of "subroutine" calling format. Instead of

Exec MyFunction(a,b,c) syntax it uses

Exec MyFunction a,b,c

Is that only for Microsoft SQL Studio or for any occurancies? If my SP call for another SP inside, should it be with no brakets call too? (This affects my RegEx heavily :-( )

Thanks.