Regex matches in C# but not in java

Question

I have the following regex (long, I know):

(?-mix:((?-mix:(?-mix:\{\%).*?(?-mix:\%\})|(?-mix:\{\{).*?(?-mix:\}\}?))
|(?-mix:\{\{|\{\%)))

that I'm using to split a string. It matches correctly in C#, but when I moved the code to Java, it doesn't match. Is there any particular feature of this regex that is C#-only?

The source is produced as:

String source = Pattern.quote("{% assign foo = values %}.{{ foo[0] }}.");

While in C# it's:

string source = @"{% assign foo = values %}.{{ foo[0] }}.";

The C# version is like this:

string[] split = Regex.split(source, regex);

In Java I tried both:

String[] split = source.split(regex);

and also

Pattern p = Pattern.compile(regex);
String[] split = p.split(source);

Answer 1

Here is a sample program with your code: http://ideone.com/hk3uy

There is a major difference here between Java and other languages: Java does not add captured groups as tokens in the result array (example). That means that all delimiters are removed from result, though they would be included in .Net.
The only alternative I know is not to use split, but getting a list of matches and splitting manually.