Replace part of XML by using regex capture group

Question

I want to capture a part of an XML string and replace a captured value with a new one.

I have the following code:

Regex regex = new Regex("<ns1:AcctId>(?<AcctId>.*?)</ns1:AcctId>");
Match match = regex.Match(Xml);

string AcctId = match.Groups["AcctId"].Value;

string IBANizedAcctId = IBANHelper.ConvertBBANToIBAN(AcctId);

newXml = Regex.Replace(oldXml, regex, IBANizedAcctId); //DOES NOT WORK!

So I want to capture the AcctId in the ns1:AcctId XML element. Then I want to replace this one with a new value by converting the BBAN to IBAN and replace the value. The first part works, but I do not know how to accomplish the last part (I did find an idea here, but I do not understand it).

I hope someone can help me out!

here are the 2 changes i made to your existing code: Match match = regex.Match(oldXml); -and- string newXml = oldXml.Replace(AcctId, IBANizedAcctId); — MaxOvrdrv
– MaxOvrdrv, Commented May 5, 2014 at 17:06
Cannot answer it either: but I found this solution thanks to this answer: I know that the last part should be: Xml = Regex.Replace(Xml, regexString, string.Format("$1{0}$3", IBANizedAcctId)); where the regexString has three capturing groups: string regexDestAcctIntString = "(<ns1:AcctId>)(?<AcctId>.*?)(</ns1:AcctId>)"; The $1 and $3 refer to respectively the first and third capturing group and replace the middle with the new value. 80% sure it works. — user2609980
– user2609980, Commented May 5, 2014 at 17:13
try it out... mine will work 100% as well, and across your entire Xml string. Not just the match. Up to you ;) — MaxOvrdrv
– MaxOvrdrv, Commented May 5, 2014 at 17:15

MaxOvrdrv · Accepted Answer · 2014-05-05 17:31:09Z

1

Regex regex = new Regex("<ns1:AcctId>(?<AcctId>.*?)</ns1:AcctId>");
Match match = regex.Match(oldXml);

string AcctId = match.Groups["AcctId"].Value;

string IBANizedAcctId = IBANHelper.ConvertBBANToIBAN(AcctId);

newXml = oldXml.Replace(AcctId, IBANizedAcctId); //should work...

answered May 5, 2014 at 17:31

MaxOvrdrv

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2 Comments

user2609980 Over a year ago

I want to capture all occurences of <ns1:AcctId> *** </ns1:AcctId>, and they can contain different numbers.

user2609980 Over a year ago

I accepted the answer since it does work! But my requirement now is a bit different. I made a new question for that one here.

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