CODEWITHSUNDEEP
c#.netregex
Omanshu Chaurasia
Omanshu Chaurasia

Reputation: 161

Why is my regex not working in C# but working in other text editors?

I have a Regex as follows:

Pattern: <navPoint id="navPoi[^"]+" playOrder="[^"]+"><navLabel><text>([^<>\r\n]+)</text></navLabel><content src="([^<>\r\n]+)"/>$

Substitution: <li id="NavPoint-#"><a href="$2">$1</a>\r\n<ol>

It works in normal editors and even in regex101: Demo with Input

I want to write the same in C#, but when I do, it does not work. Am I doing something wrong?

Here is my code:

string secondPattern = @"<navPoint id=""navPoi[^""]+"" playOrder=""[^""]+""><navLabel><text>([^<>\n]+)<\/text><\/navLabel><content src=""([^<>\n]+)""\/>$";
string secondSubstitution = @"<li id=""NavPoint-#""><a href=""$2"">$1</a>\r\n<ol>";
Regex secondRegex = new Regex(secondPattern, options);
string anotherNavMap = secondRegex.Replace(newNavMap, secondSubstitution);

Upvotes: 2

Views: 115

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626758

You should make sure you pass RegexOptions.Multiline option to the regex compile, and allow the CR before the $ end of line anchor as $ in multiline mode only matches before an LF symbol.

Also, @"\r\n" is a string of 4 characters, if you need a CRLF linebreak, use "\r\n", as verbatim string literals do not support string escape sequences.

Here is a code fix:

string secondPattern = @"<navPoint id=""navPoi[^""]+"" playOrder=""[^""]+""><navLabel><text>([^<>\n]+)</text></navLabel><content src=""([^<>\n]+)""/>\r?$";
string secondSubstitution = "<li id=\"NavPoint-#\"><a href=\"$2\">$1</a>\r\n<ol>";
Regex secondRegex = new Regex(secondPattern, RegexOptions.Multiline);
string anotherNavMap = secondRegex.Replace(newNavMap, secondSubstitution);

Upvotes: 1

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