That's it exactly. And your explanation was a lot more succinct than mine, too! Thanks. ------------------------------ John Wismar BSA - AllData Offline Products john.wismar@alldata.com

-----Original Message----- From: Jim.Hyslop [mailto:jim.hyslop@leitch.com] Sent: Friday, May 30, 2003 6:10 AM To: 'Boost-Users@yahoogroups.com' Subject: RE: [Boost-Users] Regex: matching either of 2 fields, in any orde r

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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? I could be wrong, but I interpreted the OP's question to mean: is it

John Maddock wrote: [unknown] wrote (please try to attribute quotes) possible to have the regex generate an error if more than one sub-field of a specific type is found, i.e. the following would be invalid:

~C123~C345

The original poster can correct me if I've misinterpreted anything.

-- Jim

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