Converting C# Regex into C++/CLI?

Question

I'm having trouble getting my C# Regex working for C++. In C# I have:

 //using System.Text.RegularExpressions;
 Regex YourName = new Regex("?<name>\w{3,16}");

but in C++ this does not correctly match:

 //using namespace System::Text::RegularExpressions;
 Regex^ rx = gcnew Regex("?<name>\w{3,16}", static_cast<RegexOptions>(RegexOptions::Compiled));

followed by:

 MatchCollection^ matches = rx->Matches( input ); //input=String^

Matches always return 0 count. Am I doing something really silly? Is there something special you need to do to convert C# regex into C++ regex? Many thanks for any light you can shed on this.

That's C#, not C. C has no regexes of any type.

Billy ONeal
– Billy ONeal

2010-06-04 20:11:39 +00:00
Commented Jun 4, 2010 at 20:11 — Billy ONeal
– Billy ONeal, Commented Jun 4, 2010 at 20:11

SLaks · Accepted Answer · 2010-06-04 20:12:34Z

3

You need to escape the \ from the compiler, like this:

Regex^ rx = gcnew Regex("?<name>\\w{3,16}", static_cast<RegexOptions>(RegexOptions::Compiled));

answered Jun 4, 2010 at 20:12

SLaks

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2 Comments

Matt Greer Over a year ago

Wouldn't he need to escape it in the C# one too? OP, are you sure your C# version doesn;'t have a literal string (starts with @"...")?

Dororo Over a year ago

hah, yes you're right. Completely missed that. That does fix it though, thanks to both of you.

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