add a simple regex function like ofSplitString()

Todd's example has this code a few times in it by hand, but I'm thinking it's so simple it could be added along side ofSplitString() and would be really useful ? for sure, more string utility functions are helpful, and for basic text parsing, this is great. Poco gives us this for free, so it doesn't seem like a huge stretch to think of something like this, plus find and replace, etc. Would make the regex example much shorter.

p5 has something similar, if that's a helpful argument:

http://processing.org/reference/matchAll_.html

vector < string > ofxRegex::getMatchedStrings (string contents, string regex );
vector < string > ofxRegex::getMatchedStrings (string contents, string regex ){

    vector < string > results;
    RegularExpression regEx(regex);
    RegularExpression::Match match;

    while(regEx.match(contents, match) != 0) {

        // we get the sub string from the content
        // and then trim the content so that we
        // can continue to search 
        string foundStr = contents.substr(match.offset, match.length);
        contents = contents.substr(match.offset + match.length);

        results.push_back(foundStr);

    }
    return results;
}

Start by locating the existing ofxRegex and ofSplitString implementations, then review how the regex example currently performs matching by hand. Add a utility that returns the matched strings for the supplied contents and regex, and confirm the regex example can use it to become shorter.