Error on using regex in dmd v2.088.1

[Dharmil Patel]

In my code I am using regex like this:

        auto rgxComma = regex(r",");

On compiling with dmd v2.076.1, it compiles successfully, but on 
compiling with dmd v2.088.1, I am getting lots of errors like:

/src/phobos/std/regex/internal/thompson.d-mixin-836(837): Error: 
template instance 
std.regex.internal.thompson.ThompsonOps!(EngineType!(char, 
Input!char), State, true).op!cast(IR)164u error instantiating