Hello. I have some strange problem and have no idea how to solve it or where to look father. I have two regular expressions: (\s) ( ) //<== this one contains single space between brackets. I use match algorithm and as a argument I pass string with single space. In the product, the first regular expression (\s) doesn't work, while the second does. I created stand-alone tester - both expressions work as expected. Using proc file system, I compared environment variables, specifically LANG is set to "en_US.UTF-8". Both executables load same Boost.Regex shared library. I am using GCC 3.3.3, on RedHat. The boost version is 1.34. Searching the web didn't help too. Any help is appreciated. Thank you. -- Roman Yakovenko C++ Python language binding http://www.language-binding.net/