Why does a regular expression that works fine in php not work in c#?

Question

Regular Expressions

The regular season itself: https://regex101.com/r/wQ5aA7/1

Answer 1

Because regular expressions have many dialects.
Apparently C# doesn't support some of the metacharacters you used, or the escaping for C# was bugged.

Answer 2

Everything turned out to be easier, without reading books)
I looked at the matches in the wrong place - just in [0] and not in Groups