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? Do I need to compile my applications with the macro defined as a compiler option? Is it sufficient to define the macro in a source file before including the boost/regex.h header? -- Dick Hadsell 914-259-6320 Fax: 914-259-6499 Reply-to: hadsell@blueskystudios.com Blue Sky Studios http://www.blueskystudios.com 44 South Broadway, White Plains, NY 10601