Richard Hadsell wrote:
I just discovered the Regex algorithm selection macros that have been around for a long time. I noticed that BOOST_REGEX_RECURSIVE is supposed to enable a faster algorithm, and it is not the default on Linux systems. Most of our patterns are very simple, so I am not worried about pathological cases, and I would like to try the recursive algorithm.
Do I need to modify boost/regex/user.hpp before building the library?
Yes.
Do I need to compile my applications with the macro defined as a compiler option?
Not if you've changed user.hpp.
Is it sufficient to define the macro in a source file before including the boost/regex.h header?
No the library has to built with the same options as you use in your application. BTW the performance difference between the recursive and non-recursive algorithms is actually quite small. HTH, John.