XML parsing with optional element in regex

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I have some xml that looks like:\[code\]<records> <Customer> <Reference>123</Reference> <Name>John Smith</Name> <Address1>1, The street</Address1> <Address2>Upper Town Street</Address2> <Address3>Anytown</Address3> <Address4>County</Address4> <PostCode>POS TCD</PostCode> </Customer></records>\[/code\]but for which Address2 is optional, so this is also valid: \[code\]<records> <Customer> <Reference>123</Reference> <Name>John Smith</Name> <Address1>1, The street</Address1> <Address3>Anytown</Address3> <Address4>County</Address4> <PostCode>POS TCD</PostCode> </Customer></records>\[/code\](Note: this is a cut down xml snippet)I have the following regex that matches correctly when Address2 is specified:\[code\]<Reference>(?<Reference>.*)</Reference>[\w|\W]*<Name>(?<Name>.*)</Name>[\w|\W]*<Address1>(?<Address1>.*)</Address1>[\w|\W]*<Address2>(?<Address2>.*)</Address2>\[/code\]It doesn't work for the case when Address2 isn't specified. The closest I've got is the following :\[code\]<Reference>(?<Reference>.*)</Reference>[\w|\W]*<Name>(?<Name>.*)</Name>[\w|\W]*<Address1>(?<Address1>.*)</Address1>[\w|\W]*(<Address2>(?<Address2>.*)</Address2>)?\[/code\]which matches and populates Reference, Name and Address1 for both xml snippets, but which leaves Address2 blank in both cases rather than having a value of Upper Town Street for Address 2 for the first snippet. Aside: I know that using an xml parser would be probably easier but the xml isn't clean and this was supposed to be a quick and easy solution(!). I also know that I can break this down into a set of regexs to resolve, but this has now become a bit of an intellectual challenge. And I'd love to have a solution to it.