What is the error in the expression?

Question

Regular Expressions

I write a regular expression and it does not find matches

Regex.IsMatch(s, @"^(
                                                    ([#№\p{Sc}]?\d+[%\p{Sc}]?)
                                                |
                                                    (\p{P}?\s*)
                                                |
                                                    (\w+)
                                                )$", RegexOptions.Singleline)

I submit in turn such lines
12
space
ert
, space
erw12
everything shows it didn’t fit, but I think that only the last one should not fit
, what was wrong?

Answer 1

and what about the huge spaces and carries in the regex example?
look at this result
is it supposed to be like this?
https://regex101.com/r/npoITO/1