Hi, I'm playing around with the boost::regex library and I want to match two tokens from a filename. For example files with the following format: myname_123.dat I want to be able to determine the string and number separated by the underscore. So the result of my match should be "myname", and 123. In python, I can do it like this: import re

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x = 'myclass_123.dat' result = re.match(r'(\w+)_(\d+)\.dat$', x) result.group(1) 'myclass' result.group(2) '123'

I'm having problems getting the same result in C++. This is the sample program: int main(int argc, const char** argv) { boost::regex expression("(\\w+)_(\\d+)\\.dat$"); std::string filename(argv[1]); boost::cmatch what; if(boost::regex_search(filename.c_str(), what, expression)) { for (int i=0;i<what.size();++i) { std::cout << what[i].first << " " << what[i].second << std::endl; } } return 0; } The output of this program is:

openmp3 alexis_1023.dat alexis_1023.dat alexis_1023.dat _1023.dat 1023.dat .dat

How do I get my groups "alexis", 123 as in Python? Thanks, Alexis Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/