What is the correct function or cast to compare an unprintable ASCII character value to a string slice

[monarch_dodra]

On Friday, 28 March 2014 at 15:33:32 UTC, Gary Miller wrote:
> If I need to examine a byte in string for a specific ASCII 
> value like
>
> string MyString;
>
> MyString = "Hello World"
>
> and I want to check a position in the string for a certain 
> unprintable ASCII value like the ASCII Block 219 what is the 
> recommended method for doing so
>
> if (MyString[0..1])== ???(219)) writeln("ASCII Block found")
>
> I know there's and easy lib function or cast somewhere but 
> everywhere I've looked it's not jumping out at me.

219 is not an "ASCII Block". You can just do a search for 219 in 
your *byte* stream:

auto b = ("hello" ~ cast(char)219 ~ 
"world").representation.canFind(219);

The "representation" part *very* is important: Without it, you 
string will be interpreted as unicode, and there is *not* 
actually a 219 codepoint in there.