Boost::regex tip of the day

If you use boost::regex, don’t do what I just did.

1. Calling boost::regex_match(std::string&,match_results&,basic_regex&)
2. Changing the std::string that was passed to regex_match.
3. Trying to look at the sub-matches in the match_results object.

I didn’t realize that match_results kept references to the string, and so you can’t edit the string.

Perhaps that will save someone from hitting an assert().