Since VS2013, VS uses then .NET regex syntax, which is more standard and that is a good thing.
However, I haven't been able to find a shorthand for matching identifiers, which previously was :i!
MSDN says that :i was replaced by \b(_\w+|[\w-[0-9_]]\w*)\b ... so does this short reference.
Is there really no shorter version?
Let's check:
VS2005-2010:
C/C++ Identifier
:i
Shorthand for the expression ([a-zA-Z_$][a-zA-Z0-9_$]*). Matches any possible C/C++ identifier.
VS2012-2015:
Match an identifier
\b(_\w+|[\w-[0-9_]]\w*)\b
Matchestype1but not&type1or#define.
Now, test the new regex and old regex. The results are the same and both match &type1 and #define. No idea if it is intended.
However, when it comes for shortening, [\w-[0-9_]] is almost equal to \p{L} in .NET (\w without 0-9 and an underscore, but still matching some Hindi and some other digits). I guess \p{L} was actually meant, and you can use \b(_\w+|\p{L}\w*)\b.
If you do not want to match &type or #define, you need a look-behind version:
\b(?<![&#])(_\w+|\p{L}\w*)\b
Or - perhaps - with a whitespace check before the word:
(?<=^|\s)(_\w+|\p{L}\w*)\b
