Re: [Boost-Users] Regex: matching either of 2 fields, in any order

I can see how I could do this in a loop to replace the different subfields. Is there another step I would need to take to guarantee that there is at most one of each type of subfield?

Well if you search for "C(\\d+)|O(\\w+)" it can only match one or the other can't it? Or am I missing something? John.