std.regex.replace issues

[Andrej Mitrovic]

I've tried using this:

    auto file = File("file.cpp", "r");
    char[] replacement;
    foreach (char[] line; file.byLine())
    {
        replacement = line.replace(regex("//.*"), ".");
        // do something with replacement while its still alive..
    }

This gives me this bombshell of an error:
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(2666): Error: cannot 
implicitly convert expression (result) of type string to char[]
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(2571): Error: template 
instance std.regex.RegexMatch!(char[]).RegexMatch.replace3!(string) error 
instantiating
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(1838):        instantiated 
from here: replace!(string)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(2854):        instantiated 
from here: replaceAll!(string)
qttod.d(15):        instantiated from here: replace!(char[],Regex!(char),string)
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(1838): Error: template 
instance std.regex.RegexMatch!(char[]).RegexMatch.replace!(string) error 
instantiating
D:\DMD\dmd2\windows\bin\..\..\src\phobos\std\regex.d(2854):        instantiated 
from here: replaceAll!(string)
qttod.d(15):        instantiated from here: replace!(char[],Regex!(char),string)
>Exit code: 1

I want to compose with `replace`. So I figured using char[]'s would avoid 
duplication. I want to use code like this:

    char[] replacement;
    foreach (char[] line; file.byLine())
    {
        replacement = line.replace(regex("->"), ".")
                                  .replace(regex("::"), ".")
                                  .replace(regex("//.*"), "")
                                  .replace(regex("\\*"), "");
       // do something with replacement while its still alive..
    }

How would I go about achieving this?
And if I use strings instead isn't this going to involve a lot of duplication?