How to combine multiple .net regex into one?

Question

var keyList = new[] { "AccountKey", "PrivateKey", "APIKey", "DefectiveKeyGracefulExpiration" };
var multiplePatternMatching = string.Format("({0})", string.Join("|", keyList));
var keyRegex = string.Format(@"(?s)<([\s<]?{0}[\s<]*)>.*?</\1>", multiplePatternMatching);

And I have another regex:

var passwordRegex = @"(?si)<([^\s<]*password[^\s<]*)>.*?</\1>";

How to combine keyRegex and passwordRegex into one regex? I known that I need to use | but I don't know how.

I'm trying to use | like this:

var keyOrPasswordRegex = string.Format( @"(?s)<([\s<]?{0}[\s<]*)>.*?</\1>|(?si)<([^\s<]*password[^\s<]*)>.*?</\2>", multiplePatternMatching);

but it's doesnt work

Input:

<job xmlns:i="..." xmlns="...">
<password>asdfasdf</password>
<adminPassword>asd</adminPassword>
<AccountKey>asd</AccountKey>
<AccountKeyZ>asd</AccountKeyZ>
...</job>

Actual result:

<job xmlns:i="..." xmlns="...">
 <></>
 <></>
<AccountKey></AccountKey>
<AccountKeyZ>asd</AccountKeyZ>
...</job>

Expected result:

<job xmlns:i="..." xmlns="...">
<password></password>
<adminPassword></adminPassword>
<AccountKey></AccountKey>
<AccountKeyZ>asd</AccountKeyZ>
...</job>

Already answered here: stackoverflow.com/questions/869809/combine-regexp — Pedro G. Dias
– Pedro G. Dias, Commented Mar 21, 2016 at 18:51
I think you have a problem with a backreference here, you need to be careful not to break the order of capturing groups. Use var multiplePatternMatching = string.Format("(?:{0})", string.Join("|", keyList)); var keyRegex = string.Format(@"(?s)<([^\s<]*{0}[^\s<]*)>.*?</\1>", multiplePatternMatching); — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 21, 2016 at 19:08
@WiktorStribiżew thanks, and how to combine keyRegex with passwordRegex ? — Anatoly
– Anatoly, Commented Mar 21, 2016 at 19:11
Ok, I see that key regex means a regex for tags that include key word and their content must be reset. Try Regex.Replace(input, @"(?si)<([^\s<]*password[^\s<]*|(?:AccountKey|PrivateKey|APIKey|DefectiveKeyGracefulExpiration))>.*?</\1>", "<$1></$1>"). See this demo. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 21, 2016 at 22:00

Wiktor Stribiżew · Accepted Answer · 2016-03-22 09:11:15Z

You need an alternation like this:

var keyList = new[] { "AccountKey", "PrivateKey", "APIKey", "DefectiveKeyGracefulExpiration" };
var multiplePatternMatching = string.Format("({0})", string.Join("|", keyList));
var rx = string.Format(@"(?si)<([^\s<]*password[^\s<]*|{0})>.*?</\1>", multiplePatternMatching);
Console.WriteLine(Regex.Replace(s, rx, "<$1></$1>"));

See the IDEONE demo and a regex demo. Explanation:

< - a literal <
([^\s<]*password[^\s<]*|{0}) - (Group 1) 0+ characters other than whitespace and < followed with a word password and followed with 0+ characters other than whitespace and < or an alternation group of AccountKey, PrivateKey, APIKey or DefectiveKeyGracefulExpiration (those listed in the multiplePatternMatching variable)
> - a literal >
.*?</\1> - any 0+ symbols, as few as possible, up to the first </ followed with the contents of the first capture group and >.

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