[Boost-users] Simple regex question

From: david v (danova_fr_at_[hidden])
Date: 2007-07-04 04:24:28

Hello,
I'm trying to use regex_search to look for regular expressions.

regex = (david|divad)
stringtosearch = "david"

So I'm looking for regex above in the string "david". As you see a very 
basic example. I'm expecting to find two hits, but I thought I should 
recover "david" and "david" and not twice the same match "david" ???

Here is a snippet of the code:

....
boost::smatch match;
start = stringtosearch.begin(); //that would be the start of "david"
end = stringtosearch.end(); // that would be the end of "david"
old_pos = 0;
cout << "Looking for regex:" << regex << " in string " << stringtosearch << 
endl;
while (boost::regex_search(start,end,match,regex))
      {

        old_pos += match.position()+1;
        std::string t = match[0];

        std::cout << "\tFound:" << match[0] << endl;

        old_pos += match.length();
        start = match[0].second;

  }
  catch(const std::exception &regex)
    {
      std::cerr << "Exception:" << regex.what() << std::endl;
      exit(-1);
    }

Here is the output:
Looking for regex:(david|divad) in string david
Found david
Looking for regex:(david|divad) in string david
Found david

As you can see, pattern "david" is found twice ??? I was expecting two 
different patterns to be found "david" and "divad".

By the way how can I recover the total number of matches found ??

thanks,

david

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