rem: return; 
add: return match; 
context:     function replaceParam(match, longName, shortName)    {        if (typeof longName != "undefined" && longName)        {            // Remember to encode these, don't want some dodgy # breaking stuff.            if (longName in longCodes)                return encodeURIComponent(longCodes[longName]);            dd("Unknown long code: " + longName);            return;        }        else if (typeof shortName != "undefined" && shortName)        {            if (shortName in shortCodes)                return encodeURIComponent(shortCodes[shortName]);            dd("Unknown short code: " + shortName);            return;        }        dd("Unknown match: " + match);    };
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