Recursive RegEx in .NET? (?R)

Question

When I use (?R) in a RegEx pattern in .NET, I get an ArgumentException:

Unrecognized grouping construct.

Does (?R) this have a d

Answer 1

According to the documentation, (?R) is not a valid construct in .NET regular expressions, nor is there any mention on that page of "recursive" or "recursion" so apparently this is not supported in .NET.